Feature 1Made of high quality ABS material, it is durable, wear-resistant, corrosion-resistant and can be used for a long time. 2Equipped with high-precision sensor, it is sensitive in response and accurate in measurement results, and widely used in industry and laboratory. 3With LCD backlight display, the measurement results can be directly displayed on the screen, convenient for observation. 4This product is mainly used to measure the level of ORP and observe the trend of obtaining or losing electrons. 5Small size, compact structure, easy to carry, suitable for aquarium, hydroponics, hot spring, swimming pool and other water systems.Condition: 100% Brand NewItem Type: Water Quality TesterMaterial: ABSTest Range: 0 - 1999mVResolution: 1MVAccuracy: +-5MVOperating Temperature: 0C -50CBattery: 2 x 3 V Button Battery (CR1632) (Battery Not Included)Weight: Approx. 97g / 3.4ozSize: Approx. 147x27x8mm / 5.8x1.1x0.3in.w-e-text table td,.w-e-text table th,.wang-edit-text table td, .wang-edit-text table th{border: .5pt solid #000;};.w-e-text table,.wang-edit-text table{border: 1px solid #000 !important;}Package List1 x Water Quality Tester (Battery Not Included)1 x Instruction Manual1 x ScrewdriverNote1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.