The MT405EX is an intrinsically safe NCV Voltage Detector for use in potential explosive environment. The MT405EX is certified in accordance with the ATEX directive EX ll 2 G EX ib op llB T4 Gb in Zones 1 and 2. The NCV voltage detector has a dual range, a low measuring range down to 12 volts and a high measuring range from 12V to 1000V. Suitable for outlets or against wire insulation testing, this non-contact AC Voltage Detector has a switch to turn the unit on and a Green LED indicates it is working. There is a Red LED, an audible sound as well as a vibration to indicate the presence of voltage. It has a rugged double moulded IP67 waterproof housing that can withstand a 2m drop. There is a bright built-in LED flashlight ideal for use in dimly lit areas. Features : Certified in accordance with the ATEX directive EX II 2 G Ex ib op IIB T4 Gb CAT IV 1000V IP67 waterproof and dust proof Intrinsically Safe 12V to 1000V detection Thinner probe tip for working with socket outlets Green LED means Power on, flashing red LED with beeper means Voltage detected Two modes, green indicates high voltage mode, Yellow LED 12V Mode Flash and beep rate increases as the detector gets closer to the voltage. Power On/Off with silent mode 2m drop-proof Build-in Flashlight