One instrument with two uses, it can test the electric field and the magnetic field radiation at the same time.Sound-light alarm, when the test result exceeds the safe value, the instrument will alarm automatically.Data locking,one-key lock of the radiation value.LCD display of the values for easier reading.Radiation assessment, remind you whether the radiation value is safe or not.Keeping dataLow electricity promptAuto -offFashionable design,easy on-hand operation, it's easy to carry and make field measurement.Material: PlasticUnit: V/m (Electric Field); T(Magnetic Field)Accuracy: 1V/m(Electric);0.01T(Magnetic)Range: Electric: 1-1999V/m; Magnetic: 0.01-19.99TAlarm Threshold: Electric: 40V/m; Magnetic: 0.4TDisplay: 3-1/2 LCD DisplayTest Bandwidth: 5Hz-3500MHzSampling Time: Approx. 0.4 SecondsTest Mode: Bimodule Synchronous TestOver Range Indication: LCD Displays ""1""Operating Temperature: 0-50 CelsiusOperating Humidity: Relative Humidity Less than 80% Supply: 1 * 6F22 9V Battery (NOT included)colour:blackMaterial:ABS+ electronic componentssize:6 * 2.7 * 13.5cmPackage Contents:1 X Electromagnetic Field Radiation Tester1 X English User ManualOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.