Features:  Adopt large LCD display screen, the value can be clearly displayed on the screen and easier for you to read, and give you a better experience.  This detector can simultaneous detection of electric and magnetics field radiation for you, allows you to get two important values in one test.  Sound and light dual alarm function, it will automatic alarm when the test value over the safety value.  Data hold function:  You can short press "Power / HOLD" button and the reading will be locked and [HOLD] icon shows up on the screen, press again to resume normal measurement and [HOLD] icon will not show.  Portable size and easy to carry, you can use it easily with one hand and carry it with you to anywhere you want to use.  Radiation assessment function, which can indicating if current radiation value is at safety level, three color light indicating the current magnetic field states: safety, alert, avert, and if the electric field data over the safety state, the screen will become red to alarm you.  Wide applications: This tester can be used for electromagnetic radiation monitoring of House and apartment, office, outdoor and industrial site, electromagnetic radiation test of mobilephone, computers, TV set, refrigerator and high voltage cable radiation test, radiation protections product test such as test effects of radiation proof clothes, radiation proof film and other prevents.    Specifications:  Material: ABS  Unit:  Electric field: V/m  Magnetics field: uT/mG  Accuracy:  Electric field: 1V/m  Magnetics field: 0.01uT/0.1mG  ranges:   Electric field: 1-1999V/m  Magnetics field: 0.01-99.99uT/0.1-999.9mG  Alarm threhold:  Electric field: 40V/m  Magnetics field: 0.4uT/4mG  Measurement bandwidth: 5Hz-3500MHz  Sampling time: about 0.4s  Overload indication: max value of measurement ranges on LCD  Operating temperature: 0-50℃  Operating humidity: relative humidity below 80%  Working voltage: 4.5V  Power: 3 * AAA battery (NOT INCLUDED)  Package size: 130 * 64 * 27.5mm / 5.1 * 2.5 * 1.1in  Package weight: 125g / 4.4ounce    Packing list:  1 * Electromagnetic Radiation Tester