* Range : 0 to 20.0 mg/L x 0.1 mg/L.
* Temperature : 0 to 50 oC, oC/oF.
* Automatic temperature compensation.
* Separate DO probe easy for remoting operation.
* Polarographic type oxygen electrode, professional.
* Data hold, Record ( max., min. ).
* External calibration buttons.
* DC 1.5V battery ( UM-4, AAA ) x 4.