1.This is a electromagnetic radiation tester,can test electric field radiation and magnetic field emission to reach the optimal test result. 2.Founctions:Data locking,keeping data,low electricity prompt,auto power-off. 3.Used widely in electrical equipment,electromagnetic radiation measurement,phones,computers and other radiation sources tested. Specifications: Color: black Material: ABS Unit: V/m (Electric Field); T(Magnetic Field) Accuracy: 1V/m(Electric);0.01T(Magnetic) Range: Electric: 1-1999V/m; Magnetic: 0.01-19.99T Alarm Threshold: Electric: 40V/m; Magnetic: 0.4T Display: 3-1/2 LCD Display Test Bandwidth: 5Hz-3500MHz Sampling Time: . 0.4 Seconds Test Mode: Bimodule Synchronous Test Over Range Indication: Yes Operating Temperature: 0-50/30~122 Operating Humidity: Relative Humidity Less than 80% Package Contents: 1 x ET825 Electromagnetic radiation detector Only the above package content, other products are not included. Note: Light reflection 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.