Extech-p H-ORP-Temperature-Data-Logger-EXTECH-SDL100-p-The-Extech-SDL100-p H-ORP-temperature-data-logger-records-data-on-an-SD-card-in-Microsoft-Excel-reg-format-for-easy-transfer-to-a-PC-for-analysis-The-user-can-manually-store-99-readings-or-set-the-logger-to-automatically-store-up-to-20M-samples-with-date-&-time-stamp-at-user-defined-intervals-of-up-to-9-hours-Supplied-with-6-x-AA-batteries-2 G Byte-SD-card-hard-carrying-case-sample-buffers-mini-p H-electrode-&-thermistor-tempe