90-1000V LED Light AC Electric Voltage Tester Volt Alert Pen Detector Sensor Electricians, maintenance, service, safety personnel, and homeowners can quickly test for energized circuits in the workplace or at home The voltage detector designed for electrical testing Small and compact pen design for easy carrying Voltage Sensitivity: 90~1000V AC (never test the voltage which is more than 1000AC) This instrument is only used to judge whether the conductor is live or not.