High quality: aluminum alloy material, durable and bright surface treatment, waterproof and corrosion resistant, Fine adjustment: metal knob fine adjustment, sturdy and practical, the valve adjustment needle is made of stainless steel, which is extremely corrosion resistant, durable, the air can reach the air bubbles in 15 seconds, and the adjustment is sensitive and precise. Sealing of high quality: high quality natural rubber is used to make the connection port have better sealing performance, excellent elasticity, better corrosion resistance, reusable spherical sealing design The bubble recorder is equipped with a one-way valve to prevent water from flowing back into the meter. The bubble recorder must be filled with water and equipped with CO2. The use of grass tank water meters can provide visible air outlets to meet the needs of aquatic plants
