USB interface function. The measured data stored in the instrument can be uploaded to computer for display, record and analysis. Auto power-off function. The instrument will automatically enter into sleep mode if no operation is taken within 15 minutes while it is on. Auto range. Convenient exchange makes your measurement more accurate. Large LCD screen with backlight can help the user see the data clearly even in the night. Very safe to use, CE approved. With overload protection and battery under-voltage indication, this insturment is widely use in electrical field.