Voltage Data Logger, AC Voltage Accuracy Not Applicable, Alert Type Light, Current Channels Not Applicable, For Phase Single, Minimum Sampling Rate 1 sec, Maximum AC Current Measurement Not Applicable, Maximum AC Voltage Measured Not Applicable, Minimum Operating Temperature Degrees F -31 Degrees F, Maximum Operating Temperature Degrees F 176 Degrees F, Compatible Operating Systems Windows 7, Windows 8, Windows Vista, Windows XP, Minimum AC Current Measurement Not Applicable