Pocketsized and portable with a switchable backlight and a large LCD display for clear reading. ATC function (automatic temperature compensation), automatic calibration, and IP65 fully waterproof design. Tests pH level and temperature of solution or water with a data hold function. Replaceable pH sensor probe the electrode probe can be replaced with an inserttype design for convenient and fast replacement. Benefits and capabilities Accurate readings across temperatures due to automatic temperature compensation and automatic calibration. Durable for damp or outdoor use with IP65 waterproof protection. Simple maintenance thanks to a replaceable inserttype pH sensor probe, enabling quick swaps and minimizing downtime. Use scenarios Aquarium and pond care: monitor and maintain safe pH and temperature to support aquatic life. Hydroponics and gardening: ensure pH in nutrient solutions to promote healthy plant growth. Field testing and education: perform onsite measurements of liquids; data hold enables easy logging of results in classroom or outdoor settings.