High Transparency Easy to observe the condition inside the test tube. Features 1-5ml calibration markings for accurate and easy reading of liquid volume. Orange compact screw sealing cap Provides a secure, tight fit to prevent sample evaporation. Resistant to low temperatures Suitable for cryogenic use down to -180C. Ideal for use in hospitals, public health stations, schools, and scientific research laboratories. Specifications: - Capacity: 5ml (vertical) - Outer Diameter: 16mm - Height: 59mm - Color: Blue - Material: Plastic Package Includes: 1 set of plastic test tubes with caps (200 pieces per bag) Note: The package includes only the items listed above. Other accessories or equipment shown in images are not included. Note: Actual color may vary slightly due to lighting conditions and display settings. Measurement error allowance: 13cm.