Test Tube Racks

White Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
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White Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

White Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

White Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

White Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Orange Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Orange Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Orange Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Orange Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Orange Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Yellow Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Yellow Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Yellow Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Yellow Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Yellow Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Blue Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Blue Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Blue Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Blue Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Blue Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Green Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Green Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Green Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Green Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Green Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Red Polyketone rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Red Polyketone rack for 16mm tubes in a 6 x 12 array. 248 x 127 x 70 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Red Polyketone rack for 20mm tubes in a 4 x 10 array. 250 x 102 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Red Polyketone rack for 25mm tubes in a 4 x 10 array. 300 x 121 x 92 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

Red Polyketone rack for 30mm tubes in a 3 x 8 array. 283 x 108 x 83 (L x W x H) mm
Securely holds a full load of test tubes or centrifuge tubes in the following popular sizes: 13, 16, 20, 25 and 30mm. Up to 72 of the smaller diameter tubes can be held at once. All sizes are moulded in six bright, permanent colours.
see larger image of this product by clicking here

White Polyketone rack for 13mm tubes in a 6 x 6 array. 102 x 102 x 56 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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White Polyketone rack for 16mm tubes in a 6 x 6 array. 126 x 126 x 68 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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White Polyketone rack for 20mm tubes in a 4 x 5 array. 128 x 103 x 83 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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White Polyketone rack for 25mm tubes in a 4 x 4 array. 122 x 122 x 75 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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White Polyketone rack for 30mm tubes in a 3 x 3 array. 109 x 109 x 84 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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Blue Polyketone rack for 13mm tubes in a 6 x 6 array. 102 x 102 x 56 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
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Blue Polyketone rack for 16mm tubes in a 6 x 6 array. 126 x 126 x 68 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Blue Polyketone rack for 20mm tubes in a 4 x 5 array. 128 x 103 x 83 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Blue Polyketone rack for 25mm tubes in a 4 x 4 array. 122 x 122 x 75 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Blue Polyketone rack for 30mm tubes in a 3 x 3 array. 109 x 109 x 84 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Green Polyketone rack for 16mm tubes in a 6 x 6 array. 126 x 126 x 68 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Green Polyketone rack for 20mm tubes in a 4 x 5 array. 128 x 103 x 83 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Green Polyketone rack for 30mm tubes in a 3 x 3 array. 109 x 109 x 84 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Red Polyketone rack for 13mm tubes in a 6 x 6 array. 102 x 102 x 56 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Red Polyketone rack for 16mm tubes in a 6 x 6 array. 126 x 126 x 68 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Red Polyketone rack for 20mm tubes in a 4 x 5 array. 128 x 103 x 83 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

Red Polyketone rack for 30mm tubes in a 3 x 3 array. 109 x 109 x 84 (L x W x H) mm
More space efficient than full size test tube racks. Will fit in ice or water baths and will not float.Have all the features of full size racks.
see larger image of this product by clicking here

White Polyketone rack for 0.5 ml tubes in a 4 x 6 array. 146mm x 92mm x 54mm (L x W x H) mm
Withstand most lab chemicals except acids. Each hole has moulded in letters and numbers for easy sample identification. Stackable when empty or full.
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White Polyketone rack for 1.5 ml tubes in a 4 x 6 array. 143mm x 90mm x 52mm (L x W x H) mm
Withstand most lab chemicals except acids. Each hole has moulded in letters and numbers for easy sample identification. Stackable when empty or full.
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White Polyketone rack for 0.5 ml tubes in a 8 x 12 array. 171mm x 112mm x 54mm (L x W x H) mm
Withstand most lab chemicals except acids. Each hole has moulded in letters and numbers for easy sample identification. Stackable when empty or full.
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Black Polypropylene rack for 0.5 - 2ml tubes in a 4 x 4 array.
Thaw, cool and incubate samples at elevated or reduced temperatures. Racks will float with a full load of filled tubes. Tubes are supported below the lip. On benchtop, rack legs prevent bottom of tubes from touching bench surface. Excellent temperature resistance from -70°C to 100°C. Each hole has moulded in letters and numbers for easy sample identification.
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White Polypropylene rack for 0.5 - 2ml tubes in a 4 x 4 array.
Thaw, cool and incubate samples at elevated or reduced temperatures. Racks will float with a full load of filled tubes. Tubes are supported below the lip. On benchtop, rack legs prevent bottom of tubes from touching bench surface. Excellent temperature resistance from -70°C to 100°C. Each hole has moulded in letters and numbers for easy sample identification.
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White Polypropylene rack for 2 - 2ml tubes in a 20 array.
Thaw, cool and incubate samples at elevated or reduced temperatures. Racks will float with a full load of filled tubes. Tubes are supported below the lip. On benchtop, rack legs prevent bottom of tubes from touching bench surface. Excellent temperature resistance from -70°C to 100°C. Each hole has moulded in letters and numbers for easy sample identification.
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White Polypropylene rack for 1 - 2ml tubes in a 8 array.
Thaw, cool and incubate samples at elevated or reduced temperatures. Racks will float with a full load of filled tubes. Tubes are supported below the lip. On benchtop, rack legs prevent bottom of tubes from touching bench surface. Excellent temperature resistance from -70°C to 100°C. Each hole has moulded in letters and numbers for easy sample identification.
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White Polypropylene rack for 13mm tubes in a 6 x 12 array. 200 x 102 x 57 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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White Polypropylene rack for 16mm tubes in a 7 x 12 array. 248 x 127 x 70 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Blue Polypropylene rack for 13mm tubes in a 8 x 12 array. 200 x 102 x 57 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Blue Polypropylene rack for 16mm tubes in a 9 x 12 array. 248 x 127 x 70 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Green Polypropylene rack for 13mm tubes in a 10 x 12 array. 200 x 102 x 57 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Green Polypropylene rack for 16mm tubes in a 11 x 12 array. 248 x 127 x 70 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Red Polypropylene rack for 13mm tubes in a 12 x 12 array. 200 x 102 x 57 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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Red Polypropylene rack for 16mm tubes in a 13 x 12 array. 248 x 127 x 70 (L x W x H) mm
Same innovative design as Unwire test tube racks. Will not float in water baths. Stackable when empty to save space. Securely hold a full load of test tubes.
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White Polypropylene rack for 10-13 mm tubes in a 8 x 12 array. 179mm x 127mm x 64mm (L x W x H) mm
Hold sample collection tubes, reaction tubes or similar diameter tubes. Will not float in a water bath. Can be used to dry inverted tubes and also to hold and dry electrophoresis and chromatography plates. Chemical resistant
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White Polypropylene rack for 14-17 mm tubes in a 5 x 10 array. 187mm x 105mm x 70mm (L x W x H) mm
Hold sample collection tubes, reaction tubes or similar diameter tubes. Will not float in a water bath. Can be used to dry inverted tubes and also to hold and dry electrophoresis and chromatography plates. Chemical resistant
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Blue Polypropylene rack for 10-13 mm tubes in a 8 x 12 array. 179mm x 127mm x 64mm (L x W x H) mm
Hold sample collection tubes, reaction tubes or similar diameter tubes. Will not float in a water bath. Can be used to dry inverted tubes and also to hold and dry electrophoresis and chromatography plates. Chemical resistant
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Blue Polypropylene rack for 14-17 mm tubes in a 5 x 10 array. 187mm x 105mm x 70mm (L x W x H) mm
Hold sample collection tubes, reaction tubes or similar diameter tubes. Will not float in a water bath. Can be used to dry inverted tubes and also to hold and dry electrophoresis and chromatography plates. Chemical resistant
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Transparent Polycarbonate rack for 10-13mm tubes in a 6 x 12 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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Transparent Polycarbonate rack for 13-16mm tubes in a 4 x 10 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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Transparent Polycarbonate rack for 16-20mm tubes in a 4 x 10 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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Transparent Polycarbonate rack for 25-30mm tubes in a 3 x 8 array. 32 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White Polypropylene rack for 10-13mm tubes in a 6 x 12 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White Polypropylene rack for 13-16mm tubes in a 4 x 10 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White Polypropylene rack for 16-20mm tubes in a 4 x 10 array. 28.5 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White Polypropylene rack for 21-25mm tubes in a 3 x 8 array. 32 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White Polypropylene rack for 25-30mm tubes in a 3 x 8 array. 32 cm x 11.5 cm x (L x W x H) mm
Easy to carry handles. Holes are keyed with moulded in numbers and letters for easy identification of tubes. Can be stacked when empty with any other racks of the same length. Will not float in water baths. Autoclaving will reduce rack strength over time.
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White & clear Polycarbonate rack for 15-16 mm. tubes in a 4 x 10 array. 285 mm x 115 mm x (L x W x H) mm
Unique end plate design allows 5° or 20° slant when rack is set down on either side. Autoclave tubes of media in the rack. While media is still hot, set rack on bench at desired angle. Media will harden with a consistent slant. Useful for incubating liquid cultures on a slant. Keyed with numbers and letter for identification. Stackable, do not float in water baths. Autoclaving will reduce strength in time.
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White & clear Polycarbonate rack for 20 mm tubes in a 4 x 10 array. 285 mm x 115 mm x (L x W x H) mm
Unique end plate design allows 5° or 20° slant when rack is set down on either side. Autoclave tubes of media in the rack. While media is still hot, set rack on bench at desired angle. Media will harden with a consistent slant. Useful for incubating liquid cultures on a slant. Keyed with numbers and letter for identification. Stackable, do not float in water baths. Autoclaving will reduce strength in time.
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