Klein Tools NCVT1P Voltage Tester, Non-Contact Voltage Detector Pen, 50V to 1000V AC, Audible and Flashing LED Alarms, Pocket Clip, Green,Red,Yellow, 5.5 x 0.72 x 1 inches

NON-CONTACT DETECTION of AC voltage in cables, cords, circuit breakers, lighting fixtures, switches, non-tamper-resistant outlets, and wires
VISUAL AND AUDIBLE INDICATORS of voltage detection with a high intensity, bright red LED, and an audible tone
BROAD APPLICATION with a 50 to 1000V AC power detection range