Features:- Quality Material: Made of quality ABS material, more durable.- Backlight Display: Does not affect the use in the dark.- Waterproof: IP55, meet daily testing requirements.- Data Hold: Data recording, convenient for measurement.- Replaceable Electrode: High cost performance.- Wide Application: Suitable for the measuring of drinking water, hydroponics, aquarium, swimming pool, etc.Specifications:Material: ABSColor: Grey+GreenPower Supply: 4 * 1.5V AG-13 Battery (Not Included)Operating Temperature: 0~50(32-122)Measurement Range: -1999~1999mVResolution: 1mVAccuracy: 5mVItem Size: Approx. 19*3.8*3.8cm / 7.48*1.5*1.5inItem Weight: Approx. 67g / 2.36ozPackage Size: Approx. 25*10.5*5cm / 9.84*4.13*1.97inPackage Weight: Approx. 143g / 5.04ozNote:Please read the Users Manual before use.Packing List:1 * ORP Tester1 * Screwdriver1 * Users Manual(English)