Want to know if the pH/temperature/redox of the water you drink is within standards? If so, this 3-in-1 pen-style pH/ORP/TEMP meter is what you need. Featuring automatic temperature compensation which will automatically compensate the solution temperature from 050, it can provide you accurate and stable reading. Suitable for aquarium pools, soilless cultures, laboratories and the environment. Features: Widely used to measure the pH/Temperature/ORP (Oxidation Reduction Potential) of water. Easy pH/ORP calibration with just a mini screwdriver and ATC (Automatic Temperature Compensation) function. Pocket size, lightweight and portable with large LCD screen for clear and easy reading. IP65 waterproof probe and replaceable sensor probe - The electrode probe can be replaced with a replaceable design for quick replacement and convenient. Test temperature in / (switchable units), easy-to-use digital water quality tester. Apply in water sources, crops without soil, aquariums, hydroponics, laboratories, spas, environmental waters, swimming pools, water purification systems, etc. Features: Blue color Material: ABS plastic Type: pH / ORP & TEMP-689 Range: pH: 0.0014.00pH 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: 050(32122) Operating temperature: 050(32122) Power supply: 4*1.5V LR44 button 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