407510 is a heavy-duty dissolved oxygen meter with a PC interface. Recall the minimum, maximum, and average measurements. Data Hold and a built-in RS-232 PC serial interface are included, together with optional data gathering software and logger. Auto power off conserves battery life. DO readings ranged from 0 to 20.0 mg/L. Includes 0.8 (20mm) diameter probe on 13ft (4m) cable, 5 membranes, rubber holster, 9V battery, and protective case.