Heavy Duty Dissolved Oxygen Meter. Super large 1.4 inch (36mm) LCD display. Dual display of oxygen and temperature. Measures dissolved oxygen from 0 to 20.0mg/L and 0 to 100.0 pct oxygen plus temperature from 32 to 122 F (0 to 50 C). Automatic Temperature Compensation from 0 to 50 C via temperature probe sensor built into polarographic type oxygen probe. Fast 0.8 second sampling time. Recall Min/Max/Average readings. Data Hold. Built-in RS-232 PC serial interface with optional data acquisition software and datalogger. Auto power off saves battery life. Kitted complete with 0.8 inch (20mm) diameter probe on 13ft (4m) cable, 3 membranes, rubber holster, 9V battery and hard vinyl carrying case. Optional Windows Data Acquisition Software and serial cable enable user to display and capture readings on a PC, and set time intervals and alarms. Optional battery operated Datalogger module stores over 8000 readings for later transfer to a PC.