Fangrui Product Details : 1. Special Function 5-led Indicator Light Represents Different Radiation Values. Application Of 50/60hz Frequency Monitoring, Dark Green 0 To 1.5 Mgauss; Green Light 1.5 To 2.5 Mgauss; Yellow 2.5 To 10 Mgauss; Orange 10 To 20 Mgauss; Red 20 + Mgauss. 2. Easy To Read Led Lights In Darkness And Sunlight. Portable, Easy To Use, Durable, Reliable And Responsive. 3. Run On Battery (not Included) And Report Emf Measurement Values In The Range Of 5 Milligauss. Used For Supernormal Wave Research And General Emf Test. 4. Test Gauss, Stay Away From Radiation, Good For Health. The K2 Flowmeter Is Often Used During Ghost Hunting And Also For Personal Safety To Identify Potentially Harmful High Emf Radiation. 5. The K2 Flowmeter Is Known For Its Reliability And Quality In The Study Of Paranormal Phenomena. This Makes The K2 Emf Inst Ent A Tool For Detecting Mental Activity And Detecting Potentially Harmful High Emf Levels In The Home Or Work Environment. Specification: Item Size: 143x53x29mm/5.63x2.