Crystal clear polystyrene round bottom culture tubes with a unique two-position screw cap for growing aerobic and anaerobic cultures.
The specially designed cap has two stop positions. Rotate a 1/4 turn and listen for a positive click. The cap is now partially open. Rotate another 1/2 turn to click it again and completely seal in the tube contents.
The top of each culture tube cap is flat for easy marking
Easy to read graduation lines.
