Fangrui Product Details 1. Smartsensor As1393 Handheld Electromagnetic Radiation Detector 2. One Emf Tester With Two Uses, Testing The Electric Field And The Magnetic Field Radiation At The Same Time. 3. Measure Radiation Of High Voltage Power Lines, Appliances, Electrical Wires. 4. Sound-light Alarm, When The Test Result Exceeds The Safe Value, The Instrument Will Alarm Automatically. 5. Data Hold And Max Measurement, One-key Lock The Radiation Value. 6. Large & Clear Lcd Display Of The Values For Easy Reading. 7. Easy To Operate With Easy One-hand Operation, Easy To Carry And Make Field Measurement. 8. Can Measure The Environment Temperature With 2 Temperature Units (cf). 9. Electric Field Strength Range: 0~1999vm 10. Electric Field Strength Resolution: 1vm 11. Magnetic Field Strength Frequency Range: 20hz~300hz 12. Electric Field Strength Frequency Range: 20hz~3500mhz 13. Power Supply: 3 X 1.5v Aaa Battery (not Included)