Precise measurement: Built-in electromagnetic sensor, after processing by the control microchip, the radiation value can be displayed on the clear LCD digital display. Use the optional unit mG/T to test the magnetic field radiation, the electric field with the unit V/m. This emf meter cannot test RF values.Sound light alarm: When the test result exceeds the value (0.4T (4mG) or 40V/m), the screen will turn red, the indicator light will flash, and the buzzer will sound an alarm. If you are testing some quiet areas, you can turn off the buzzer first to avoid disturbing others.Versatile: Test average or peak (maximum) readings and save data for viewing with one click. Large backlit LCD screen for clear viewing. It will automatically shut down after 5 minutes without any operation.Wide application: Mainly used in TV, computer, printer, microwave oven, refrigerator, cell tower, low frequency household appliances, ghost hunting, etc.Customer Service Committed to manufacturing professional and high-quality meters. We provide 36 months after-sales service and lifetime technical support. If you have any questions, please feel free to contact us, our professional after-sales team will solve your problems in time.