With glass stopper test tube is suitable for scientific research department, laboratories and colleges. With glass stopper test tube is a test tube with a frosted glass stopper and its tube body to increase capacity graduation. For volatile substances, it can be calculated directly, and can prevent volatilization of substances, so it is convenient to apply. Transparent, convenient, beautiful, firm and high Efficiency. Round bottom.
Graduation: with graduation, w/o graduation
3.3 Borosilicate glass