The Pocket Dissolved oxygen tester meter's system menu allows you to adjust six different parameters, such as temperature units and the number of calibration points. It is capable of measuring the amount of dissolved oxygen in waste water, water, and other liquids and solutions.Dissolved oxygen range-0.0 to 20.0 mg/L (or ppm);Sensor type-Polarographic dissolved oxygen probe;Data hold function-Manual or automatic;Connector-6 pin mini plug for more visit labtron.us