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 New Item Type: Water Quality Tester Material: ABS Test Range: 0 - 1999mV Resolution: 1MV Accuracy: +-5MV Operating Temperature: 0C -50C Battery: 2 x 3 V Button Battery (CR1632) (Battery Not Included) Weight: Approx. 97g / 3.4oz Size: Approx. 147x27x8mm / 5.8x1.1x0.3in 1 x Water Quality Tester (Battery Not Included) 1 x Instruction Manual 1 x Screwdriver