This REED R3000SD data-logging meter reads pH from 0 to 14 and ORP up to 1999 mV, with automatic temperature compensation and a backlit dual display for outdoor or low-light use. Readings can be stored to an SD card either manually (up to 99 points) or on an automatic interval from 1 to 3600 seconds, then pulled off as an Excel-ready file without extra software. This -NIST variant ships with a traceable NIST calibration certificate, carrying case, and batteries; the pH/ORP electrode is sold separately.