Test tubes with screw caps are graduated, clear plastic tubes that are designed for use in a centrifuge. These affordable tubes are convenient for routine lab tests. They are sold in packages of 30.
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Graduated, clear plastic tubes with screw caps have conical bottoms. Designed for use in a centrifuge, these affordable tubes are convenient for routine lab tests where the sample tubes must be capped to mix the reagents. Perfect for soil and water tests. Polystyrene, 125 mm long x 18 mm O.D. Capacity 15 mL. Sold in packages of 30.