High Transparency - it is easy to observe the condition in the test tube. With 1-5ml calibration, easy reading of the liquid volume. Orange Compact Screw Sealing Cap - firmly matched, and the sample will not volatilize. Low Temperature resistance - can be cryogenic (-180 ℃) Used in hospitals, epidemic prevention station, schools, scientific research laboratory, etc. Specification: 5ml (erect) Packing: 400 pieces Outer diameter: 16mm Height: 59mm Colour:blue Material:plastic Package Contents: 2 set x plastic tubes with caps Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.