Features: 1.High Sensitivity: Electromagnetic radiation tester's electric field and magnetic field radiation frequency range is 50Hz?2000MHz, with high sensitivity. 2.Multi Purpose: EMF tester can be used to measure the electromagnetic radiation of household appliances such as computers, mobile phones, TVs, fans, lamps, alarm clocks, refrigerators, etc. 3.Small Portable: This electromagnetic radiation detector has a compact structure and a digital LCD screen that can display three and a half digits, which is very convenient for handheld use. 4.Accurate Measurement: Handheld radiation tester is suitable for most radiation product measurement effects, demonstrations, etc., accurate and safe to use. 5.Hand Held Design: The electromagnetic radiation detector adopts a hand held design, which is easy to use, not easy to fatigue after long term use, and can also test the radiation of alternating current. specification:Item Type: Electromagnetic Radiation Tester Material: ABS Colour: Black Scope of Application:For TVs, Fans, Lamps, Air Conditioners, Alarm Clocks, Refrigerators and Other Household Appliances Bandwidth: 50Hz-2000MHz Sampling Time: About 0.4S Built in Battery: Li ion Battery Model: 6F22 (not Included) PackageList:1 xElectromagneticRadiationTester 1 xUser Manual NoteShips without battery.