Replaceable pH sensor probe - The electrode probe is designed for quick plug-in replacement, enabling convenient and fast maintenance. pH and temperature testing with data storage - Measures pH and the temperature of solutions or water, with built-in data storage to log readings for record keeping. Pocket-sized, lightweight and portable with switchable backlight and large LCD - Compact and easy to carry, with a switchable backlight and a large LCD display for easy reading in various lighting conditions. ATC function, automatic calibration and IP65 waterproof design - Includes automatic temperature compensation (ATC) and automatic calibration, and is built with a fully waterproof IP65-rated design for use in wet environments. Use scenarios - Aquarium and hydroponics: monitor and maintain accurate pH and temperature of nutrient solutions and tank water, with data logs for trend analysis. - Field water testing: perform on-site pH and temperature checks of wells, streams, lakes, and other outdoor water sources, while capturing readings for documentation. - Education and remote lab work: use the portable unit for classroom demonstrations and field data collection, leveraging the data storage for later review.