Test the pH level and temperature of solution or water with a data hold function to freeze the reading for documentation and comparison. Replaceable pH sensor probe: The electrode probe can be replaced with an inserttype design for convenient and fast replacement, reducing downtime and maintenance effort. ATC function and automatic calibration with IP65 protection: Automatic temperature compensation enhances accuracy across varying temperatures; automatic calibration simplifies setup and upkeep; the IP65 fully waterproof design provides reliable use in wet or dusty environments. Pocket size and portable: Compact handheld form fits in a pocket for easy transport; switchable backlight and a large LCD display enable clear readings in different lighting conditions. Use scenarios: Home or professional aquariums and hydroponics: Monitor pH and temperature of nutrient or water solutions to maintain healthy conditions for aquatic life and plants, with data hold for easy record keeping. Field water testing and environmental sampling: Take the device onsite to measure and log pH and temperature of water samples, aided by its portable size and durable IP65 protection. General water quality checks and maintenance: Use the pocketsized meter for quick pH and temperature checks in kitchens, laboratories, pools, or other settings where reliable, easytoread readings are needed.