Apera Instruments PC820 Precision Benchtop pH/Conductivity Meter provides reliable pH and conductivity measurements with intelligent functions in a durable structure. Equipped with Swiss LabSen 211 Combination pH electrode and 2401T-F glass-body conductivity electrode, the meter measures pH/EC/TDS/Salinity/Resistivity/Temperature in a stable and accurate manner. ORP (Redox) measuring mode available when 301PT-C ORP electrode is connected (sold separately). LabSen 211 Combination pH Electrode is made with Swiss sensor technologies and materials, featuring an impact-resistant and bubble-free sensor tip, and a long-life reference system; compatible with TRIS buffer. Intelligent Functions: Quick & Easy Auto. Calibration up to 5 points. The Self-Diagnosis function helps you identify and fix common problems occurring during calibration, and monitor the condition of your pH electrode with slope data displaying between 2 points of calibrations. Calibration reminder and calibration record check functions are also available. The large backlit LCD displays pH/EC/TDS/Salinity/Resistivity and temperature simultaneously along with icons of stable readings and finished calibrations. GLP Data management (1000 groups of data storage), USB data output and PC software support. Auto timing measurement/data logging mode available. Reliable Structure: IP54 water-resistant. It comes with a complete test kit including a meter, a pH electrode, a conductivity electrode, a temperature probe, a flexible electrode holder, a PC-Link software flash drive (Windows-based system only), a USB cable, a power adaptor (input: 120V AC 60Hz; Output: 9V--300mA), and 6 bottles of calibration solutions (4. 00 pH, 7. 00 pH, 10. 01 pH, 84μS/cm, 1413μS/cm, 12. 88mS/cm). The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.