Extech Dissolved Oxygen Meter,Datalogger, Extech Instruments (CAT#: STEM-AIAE-0051-LKN)

Dual backlit display of Oxygen Concentration and Temperature. Automatic Temperature Compensation from 0 to 50°C via temperature probe sensor built into polarographic type oxygen probe. Stores 99 readings manually and 20M readings via 2G SD card. Supplied with 6 x AA batteries, SD card, probe, two spare.

Dissolved oxygen measuring range: 0-20 mg/L, accuracy: ±0.4 mg/L
Temperature measuring range: 0-50 °C, accuracy: ±0.8 °C
Size: 7.2 in. (183 mm) × 2.9 in. (73 mm) × 1.9 in. (47.5 mm)
Weight: 25.6 oz (725 g)
Battery power: 6 AA

Offset adjustment used for zero function to make relative measurements.
Records readings with real date and time stamp.
User programmable sampling rate: 1 second to 8hrs:59min:59sec.
Min/Max and Data Hold functions.
Auto power off with disable function.
Built-in PC interface.