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 0～50℃, 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