DURFICST A40 Electric Voltage Tester with Infrared Thermometer Non-Contact Voltage Detector Pen Automatic Multimeter with VFC and Case

AUTOMATIC AND EASY TO USE: This electrical tester pen defaults to smart mode when powered on, automatically testing AC or DC voltage, frequency, resistance, and continuity. MULTIFUNCTIONAL: 3-in-1 non-contact voltage detector, multimeter, and infrared thermometer. It can also manually test AC DC voltage, resistance, continuity, frequency, temperature, and live/null wire. VFC FOR INVERTER VOLTAGE: The VFC function allows you to measure the variable-frequency output voltage of inverters. It helps you better plan operating speeds for pumps, elevators, air conditioners, compressors, and more. BACKLIT DISPLAY: This automatic electrical tester features an easy-to-read LCD display and green and red backlighting, making it easy to assess the detected voltage, even in dark and confined environments. KEEP AWAY FROM DANGER: CE standard, surge and burn protection, ergonomic and non-slip design for comfortable use at home and in industry.