Pocket Pro and Pocket Pro+ Test devices measure electrochemical parameters in various water applications. The 12 pocket meter family provides reliable accurate results, offering suitable portable results for pH, ORP, conductivity, TDS, salinity and temperature. Hach Pocket Pro+ Test devices take their value one step further with replaceable sensors, powerful backlight and multiple parameter test device options. Hach Pocket Pro+ Test devices are designed to obtain accurate results and are backed by internal performance diagnostics. You don't need to guess when to clean or calibrate your sensor. Each test device is equipped with field-suitable replaceable batteries and an easy-to-read large LCD screen. Pocket Pro and Pocket Pro+ Test devices are ideal for pool water tests measuring pH, ORP, conductivity, TDS & temperature. Convenient pocket meters are excellent for field use in analyzing industrial wastewater, drinking water and food & beverage products.