Want to know if the pH/temperature/ORP of the water you drink meets the standards? If so, this pen-style 3-in-1 pH/ORP/TEMP meter is just what you need. It has automatic temperature compensation function, which can automatically compensate the solution temperature of 0~50℃, providing you with accurate and stable readings. Suitable for aquarium, soilless culture, laboratory and environmental water use. Features: Widely used to measure pH/temperature/ORP (oxidation-reduction potential) of water. Easy calibration Just a mini screwdriver and ATC function (Automatic Temperature Compensation) to measure pH/ORP. Pocket sized, lightweight and easy to carry, the large LCD display is clear and easy to read. Waterproof grade IP65, replaceable sensor probe - the electrode probe adopts a replaceable design, which is easy and quick to replace. Test temperature ℃/℉ (switchable units), simple-to-operate digital water quality tester. Application Suitable for water sources, soilless culture, aquariums, hydroponics, laboratories, spas, environmental 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°F～158°F)Resolution: pH: 0.01pH ORP: 1mV Temperature: 0.1℃(0.2℉) Accuracy: pH: ±0.1pH ORP: ±5mV Temperature: ±1.0℃ (±2°F) Temperature compensation: 0℃～50℃ (32°F～122°F) Operating temperature: 0℃～50℃ (32° F～122°F) Power supply: 4 * 1.5 V LR44 button battery (not included) Item size: approx. 188*37*37mm/7.4*1.5*1.5 inches Item weight: approx. 75 g/2.7 oz Package Dimensions: Approx. 25*10.5*5cm/9.8*4.1*2.0in Packing weight: approx. 152g/5.4oz Packing list: 1 * 3-in-1 water quality tester 1 * User manual 1 * Mini screwdriver