The R3000SD is capable of measuring 0.00 to 14.00 pH and 0 to 1999 mV (ORP). Featuring automatic temperature compensation, Data hold, Max/Min functions, and an easy-to-read backlit LCD display. Using a SD card (max 16GB), a user can manually record up to 99 readings or automatically by selecting a desired sampling rate from 1 to 3600 seconds. Quickly generate an Excel file with raw data, all without the use of software. Optional accessories include a tripod and AC adapter for continuous long-term monitoring. Please note pH and ORP electrodes are sold separately. Features Measures pH and ORP levels in water Manual or automatic temperature compensation (with optional ATC probe, R3000SD-ATC) 3-point calibration ensures best accuracy Accepts pH/ORP Electrodes with BNC connector Real time datalogger with integrated SD memory card (optional) User selectable sampling rate Easy-to-read backlit LCD display Data hold and Min/Max functions Tripod mount for long-term monitoring Low battery indicator and auto shut off