The Extech 407510 is a high-performance measuring device with PC interface for dissolved oxygen. Retrieve min, max and average values. Equipped with measured value memory and an integrated serial RS-232 PC interface with optional data acquisition software and data logger. Automatic switch-off saves the battery. DO measurements from 0 to 20.0 mg/l. Includes a 20 mm (0.8 inch) probe with 4 m (13 ft) cable, 5 membranes, rubber holster, 9 V battery and hard case.