Input Power 90-130 V / 180 - 250V. Unit tested. All four channels tested with AC line voltage applied. A, B, C, channel measuring correctly, channel D reading is lower tan actual value and may need to be calibrated. Since we don't have current probes we could not perform current measurements. At start up unit is reporting " Database memory is corrupt ; pressing 1 goes to normal operation." Oscilloscope function working well, printer is working well. All front and back panel buttons and onnectors are in good physical and functional conditions. Unit is missing rechargeable battery and battery plastic cover. No accessories included.