Want to know whether the pH / Temperature / ORP of water you drink is up to the standard? If so, this pen-type 3-in-1 pH/ORP/TEMP meter is what you need. Featuring the automatic temperature compensation which will automatically compensate the solution temperature of 050, it can provide you the accurate and stable reading. Suitable for aquarium pool, soil-free growing, laboratory, and environment water. Features: Widely used to measure the pH / Temperature / ORP (Oxidation Reduction Potential) of water. Easy calibration of pH/ORP with just a mini-screwdriver and ATC function(automatic temperature compensation). Pocket size, lightweight and portable with large LCD display for clear and easy reading. Waterproof IP65 and replaceable sensor probe - The electrode probe can be replaced with replaceable design for convenient and fast replacement. Test temperature in / (switchable units), easy operation digital water quality tester. Apply in water sources, soil-free growing, aquarium, hydroponics, laboratory, spas, environment water, swimming pools, water purification systems, etc. Specifications: Color: Blue Material: ABS Plastic Type: pH/ORP&TEMP-689 Range: pH: 0.00 14.00pH ORP: 0 1999mV Temperature: -50 70 (-58 158) Resolution: pH: 0.01pH ORP: 1mV Temperature:0.1(0.2) Accuracy: pH: 0.1pH ORP: 5mV Temperature: 1.0(2) Temperature Compensation: 0 50 (32 122) Working Temperature: 0 50 (32 122) Power Supply: 4 * 1.5V LR44 Button Cell Battery (NOT Included) Item Size: Approx. 188 * 37 * 37mm / 7.4 * 1.5 * 1.5in Item Weight: Approx. 75g / 2.7oz Package Size: Approx. 25 * 10.5 * 5cm / 9.8 * 4.1 * 2.0in Package Weight: Approx. 152g / 5.4oz Package List: 1 * 3 in 1 Water Quality Tester 1 * User Manual 1 * Mini Screwdriver