The Hach Pocket Pro Series pH Tester is a portable pH meter that is small enough to fit in your pocket. The electrode is at the lower end of the device with a small display at the top. Each ph / ORP meter is equipped with replaceable batteries for easy field use and a large, easy-to-read LCD screen. Built-in diagnostics alert the user when the sensor needs to be cleaned or calibrated. Similar to benchtop and portable pH meters, pocket testers are used to measure the acidity or alkalinity (pH) of a sample in scientific, industrial and domestic applications, ranging from industrial wastewater, drinking water, food and beverage analysis. Pocket pH meters are a cost-effective alternative to traditional measuring instruments and sensors. Pocket Pro + testers are ideal for water analysis, measuring not only pH and ORP, but also conductivity, TDS and temperature.