DISSOLVED OXYGEN METER, two displays
Model : DO-5519
* Range : 0 to 20 mg/L x 0.1 mg/L.
* Temperature : 0 to 50 °C.
* LCD display, pocket size.
* Automatic temperature compensation.
* 1600 Data logger point.
* Separate probe, easy operation.
* RS232/USB interface, Record ( max., min. )
* Power : DC 9V battery or DC 9V adapter in.