Description: Brand new and high quality Compatible with pressurized CO2 tanks and DIY yeast bottles. Beautiful bubble counter that helps you to estimate amount of CO2 release into your aquarium. Bubbles moves along the Spiro upward, and when it escape from the Spiro, you can count bubbles per second. The counter is 5cm/1.97 inch diameter, 15cm/5.91 inch long. Specification: Material: Glass Design: 8 Spiral Size(L x W): Approx. 15 x 5cm/5.91 x 1.97inch Package Includes: 1 Piece Bubble Counter 2 Piece Suction Cup Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the the size above. Due to the lighting effects, monitor settings,etc.There could be some slight difference in the color of the pictures and the actual item.