1、Made of high quality ABS material, it is durable, wear-resistant, corrosion-resistant and can be used for a long time. 2、Equipped with high-precision sensor, it is sensitive in response and accurate in measurement results, and widely used in industry and laboratory. 3、With LCD backlight display, the measurement results can be directly displayed on the screen, convenient for observation. 4、This product is mainly used to measure the level of ORP and observe the trend of obtaining or losing electrons. 5、Small size, compact structure, easy to carry, suitable for aquarium, hydroponics, hot spring, swimming pool and other water systems. 1 x Water Quality Tester (Battery Not Included)1 x Instruction Manual1 x Screwdriver Condition: 100% Brand NewItem Type: Water Quality TesterMaterial: ABSTest Range: 0 - ±1999mVResolution: 1MVAccuracy: +-5MVOperating Temperature: 0°C -50°CBattery: 2 x 3 V Button Battery (CR1632) (Battery Not Included)Weight: Approx. 97g / 3.4ozSize: Approx. 147x27x8mm / 5.8x 1.1x 0.3in