Can Test The Electric Field And The Magnetic Field Radiationat At The Same Time---Our EMF Electromagnetic Radiation Detector( Test Range: Electrical: 1-1999V/m; Magnetic: 0.01-99.99T). Sound-light Alarm, When The Test Result Exceeds The Safe Value The Instrument Willalarm Automatically(Alarm Threshold: Electrical: 40V/m; Magnetic: 0.4T). Data Locking, One-key Lock Of The Radiation Value, The EMF Equipped With a Builtin Electromagnetic Radiation Sensor(Test Bandwidth: 5Hz-3500MHz, Sampling Time: approx. 0.4 Seconds). LCD Graphic Display of The Radiation Value Trend : Radiation Assessment, Remind You Whether The Radiation Value is Safe or not, Double Measure Display of Electric Field Magnetic Field on The Meter, Average / Peak Switching Button Function. Built-in Rechargeable Lithium-ion Battery (with USB Charging Cable), Fashionable Design, Easy on-hand Operation, Easy to Carry or Make Field Measurement.