The Dual Star CO2 meter is an instrument designed for simple, quick, accurate, and cost-effective measurement of the concentration of carbon dioxide, bicarbonate, and carbonate in aqueous solutions. It utilizes the 9502BNWP CO2 gas-sensitive electrode technology, offering a measurement range of 4.4 to 440 ppm, a pH range of 4.8 to 5.2 pH, and a temperature range of 0 to 50°C, with a repeatability of ±2%. The instrument features a dual-channel structure, allowing simultaneous connection of two pH electrodes or ion-selective electrodes for concurrent measurement and display of pH or ion concentration in the sample. The operation interface is straightforward and fast, ensuring ease of use.