It is equipped with a builtin electromagnetic radiation sensors, which can display tha radiation value on LED screen after processing by the chip You can make reasonable processing or take effective measure toward the electromagnetic radiation according to the tester result Radiation Meter is electric field, field, and radio frequency field multifuctional meter The Radiation reader also provide a maximums value, " HOLD " the screen to observe the reading, and long pressing on the power button offs the backlights to save power Sound-light Alarm: When the tester result exceeds the safe value, the instrument will alarm automatically It is used to the measurement of electromagnetic radiation in living environment such as offices, computer room, power distribution room, and transmission tower, Manufacturer: Msioytog