Delicate design for an elegant tank appearance: Exquisite craftsmanship with a smooth, bright surface that enhances the look of your aquarium and showcases the CO2 setup. Glass bubble counter with spiral movement: Bubble counter moves upward along a spiral channel to help you estimate the amount of CO2 being emitted into the aquarium. Durable, clear glass: transparent glass that is corrosion resistant and not easy to break, providing longlasting performance in aquatic environments. Broad compatibility: Suitable for use with pressurized CO2 tanks as well as yeast bottle CO2 setups, offering flexible installation options. Clear, practical CO2 monitoring: Easytoread CO2 progress as bubbles travel through the spiral, assisting accurate dosing and stable plant growth. Use scenarios: In a planted freshwater tank with a pressurized CO2 system, install the counter to monitor CO2 output and adjust the regulator for stable dosing. For DIY yeastbased CO2 generators, use the counter to gauge CO2 production and prevent overinjection. In small or nano tanks, enjoy both functional CO2 monitoring and a visually appealing component that blends with the aquascape.