The Chauvin Arnoux CA10001 tester can be used with a buffer solution for calibration to obtain the pH value with only 2 clicks. It can be used in a wide range of sectors involving electrochemistry, such as hydroponics, swimming pools, spas, education, water treatment, drinking water, aquariums, beverages industry, cosmetics and chemistry laboratories etc. This comes in the form of a pen equipped at one end with a combination electrode 12cm long with a built-in temperature sensor. The wide multi-parameter screen simultaneously displays the pH and temperature values (°C or °F). The ATC (Automatic Temperature Compensation) mode automatically displays the pH value compensated for temperature.