Feature: 1. High transparent crystal glass, acid and alkali resistance, corrosion resistance. 2. High transmittance, convenient for observation CO2 output quantity. 3. Using grinding tool, one time molding, avoid manual manufacture error. 4. Fine workmanship, free from erosion and easy to remember bubble. 5. Equipped with suction cup, fixed firmly, not easy to slip, convenient to use. Specification: Condition: 100% Brand New Item Type: Bubble Counter Material: Glass Color: As Pictures Shown Weight: Approx. 71gSize: Approx. 15x4.5x2.5cm/5.91x1.77x0.98inch Bubble counter usage: 1. When air pipe is covered, put into hot water first, such cover up can be more convenient, has to be set vertically 2. Before use, please fill the body with water through the fixing hole of the suction cup, and then insert the suction cup 3. After using for a period of time, the refiners may become blocked. Please replace them or soak them in bleach for about three to five minutes before cleaning 4. The screw bubble counter is connected to the inlet pipe on the curved side and the outlet pipe on the straight side . Package List: 1 x Bubble Counter2 x Suction Cup