※ As time goes by, scratches appear on the plastic test tubes, and the test become opaque. Glass tubes do not have these problems.
※ This set of glass tubes is made of high quality borosilicate glass. High temperature resistance and high light transmittance. The wall thickness is uniform and can be evenly heated.
※It can be used not only in the laboratory, but also other uses. It can be used in the kitchen to load seasonings. It can be used in the bathroom for bath salts. Can be filled with candy and used at parties. Can be used to breed small plants, succulents, can be used to make cocktails. More uses are waiting for you to discover!

Specification
- Material: glass
- Color: transparent
- Size: 25*200mm 20*200mm 15*150mm
- Capacity: 80ml 50ml 20ml
- Quantity: 12pcs

Precautions for using test tubes
1. Do not exceed 1/2 of the tube capacity when loading the solution, and do not exceed 1/3 of the tube capacity when heated.
2. When dropping the liquid into the test tube with a dropper, it should be suspended, the dropper should not protrude into the test tube.
3. Use a test tube holder when heating the tube. The tube mouth cannot be facing the person.
4. Preheat before heating to prevent the tube from bursting. Heat evenly.
5. The tube should not be washed after heating without cooling to room temperature.
6. Heat the tube over hottest part of fire.

Warm tips
♥ Glass test tube is fragile, take it carefully.
♥ Keep the test tube out of reach of children to avoid breakage and scratching the child's skin.

Package includes
4 * glass test tube 25*200mm with cork stopper
4 * glass test tube 20*200mm with cork stopper
4 * glass test tube 15*150mm with cork stopper

If the test tube is damaged during transportation, please contact us for a replacement.