Helps control the amount of CO2 in the tank water: The durable and safe CO2 bubble counter is used in conjunction with the water weed counter. The gas emission of CO2 to provide sufficient water for the water grass is clearly visible. Stay healthier for fish and plants: It is well known that too much or too little CO2 in the pool water can overwhelm fish and plants and too much CO2 in the water lead to a drop in the pH value. However, our bubble counter will make aquatic plants happier, healthier, brighter, and grow faster. Easy to Read: The counter's transparent design makes it easy for you to see the bubbles, so you can effectively determine the bubbles per second. Bubbles are formed by the CO2 gas in the water; the more bubbles, the more CO2. Once the counter is installed and connected, the bubbles need to be counted. Safe for Plants and FishThe bubble counter is made of high quality material, which is durable and reliable. Adding a bubble counter to your aquarium is a safe and natural way to add CO2 effectively. Quick and easy to install: The bubble counter simply connects to the current CO2 diffuser tube. Fill the bubble counter with water, attach it to the hose and attach it securely to the outside wall of your aquarium with the included suction cup. Product description Specifications: Condition: 100% Brand New Item Type: Bubble Counter. Material: Aluminum Alloy and Acrylic. Color: Silver. Optional Style: Dual Head, Single Head Dual Head Size: Approx. 8.2 x 2cm / 3.2 x 0, 8 inch (L x D). Single head size: approx. 8 x 2 cm / 3.1 x 0.8 inch (L x D). Package weight: approx. 32~34g. Installation method: Single head bubble counter: 1. Take out the sealing ring and install it on the air hose interface of the valve. Then tighten the bubble counter. 2. Fill 4/5 water into the bubble counter and then tighten the top cover. Connect the CO2 tube and tighten the nut of the trachea. Dual Head Bubble Counter: Put 4/5 water into the bubble counter, then tighten the top cover. Connect the CO2 tube and tighten the nut of the trachea. Package Includes: 1 x Bubble Counter.