The LCV data logger is a precision instrument for recording AC current and AC voltage. AC current is sampled using the supplied clamp probe. The logger can store up to 21,500 and up to 10,750 data points, when it is setup to record either AC current or AC voltage (but not both). Each logger is factory calibrated. This means that the clamp probes are not interchangeable. Sample point capacity: 10750 and 21500 points for current and voltage. Sample rate: 1 second to 18 hour. Alarms: over and under alarms for current and voltage visual alarm indication. Current range: 0 to300 Amps AC. Current accuracy: +/- 5 percent. Current resolution: 0.1 Amp AC. Voltage range: 0 to 500 volts AC. Voltage accuracy: +/- 1 V AC. Voltage resolution: 0.1 VAC. Time accuracy: +/- 100ppm at 75 degree F. Operating temperature range: 32 to 140 degree F (0 to 60 degree C) using alkaline battery, -40 to 150 degree F (-40 to 65 degree C) using lithium battery. Humidity: 0 to 95 percent, Non-condensing. Storage temperature: -40 degree F OE 170 degree F (-40 degree C OE 77 degree C). Calibration: single point offset calibration available through software, current and voltage are factory calibrated. Power source: 9V alkaline or lithium battery. Battery life (average use): 20 months using alkaline battery, 40 months using lithium battery. Measures: 3" length by 2-1/2" width by 1-3/32" height. Weight: 2.5 oz (71g)..