Item Type: Round Foam Test Tube Rack Material: Foam Use: For Storing 0.2ml, 0.5ml, 1.5ml and 2ml Test Tubes. 1APPLICATION: Centrifuge tube rack can be used to store 0.2ml, 0.5ml, 1.5ml and 2ml test tubes, perfect for school laboratory classes or professional laboratory. 2EASY REMOVAL: The Floating foam tube rack will float on the surfaces of the water, making it easy to remove samples from the bath. 3EFFECTIVE TUBE PROTECTION: The Foam tube rack ensures safe storage and prevents tubes from eaking or spilling. 4FLEXIBLE FOAM: The test tube holder is made of high density polyethylene foam that is soft and durable. The closed cell foam is resistant to water absorption and can be cleaned and reused. 5SCOPE OF APPLICATION: Foam centrifuge tube holder is ightly colored and perfect for floating tubes in a water bath, tub or beaker.5 x RoundFoamTestTubeRackManual Measurement Error of 0.1 to 0.2cm