HDE Digital EMF Meter - Electromagnetic Radiation Detector Dosimeter Tester Tool Detects EMF radiation, works great for home projects like fixing wall outlets Reads radiation being emitted from appliances, printers, copiers, smart meters and more Great for the hobbyist or professional ghost hunter or paranormal investigator Works as a detector of Electrical Field Radiation | Frequency range: 50Hz~2000MHz Measurement time intervals: 0.4 seconds; Data hold button allows user to freeze a mesurement