Apera Instruments PC400S Portable Multi-parameter Meter Kit provides quick and accurate measurements for general water solutions with intelligent functions and a durable structure. Equipped with 201T-S ATC pH electrode and 2301T-S Platinum Black conductivity electrode (K=1. 0), the meter tests pH, mV, conductivity, TDS, resistivity, and temperature in a reliable and effortless manner. ORP measurement is available when an ORP electrode is connected (Apera 301Pt-S). ORP electrode is sold separately. Accuracy: 0. 01 pH; 0. 1 percent F. S; 1 percent F. S; range: -2. 00 to 19. 99 pH, -1999 mV to 1999 mV, 0 to 200. 0 mS/cm. Auto. or manual temperature compensation. Intelligent functions: quick & easy 1 to 5 points auto. calibration with calibration guide and slope display between calibrations (calibration reminder function available); The self-diagnosis helps you determine the condition of your pH probe. GLP data management (1000 groups of data storage) with PC software support, USB data output and power supply. Auto. timing data logging mode available. Reliable structure: IP57 water-resistant, ideal for use in harsh environments. It comes with a complete kit, including a meter, a pH electrode, a conductivity electrode, a USB cable, software flash drive, and 6 bottles of calibration solutions, all in a rugged carrying case. Powered by AA batteries. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.