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 data Low electricity prompt Auto power-off Fashionable design,-hand operation, it's easy to carry and make field measurement. Material: Plastic 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: LCD Displays ""1"" Operating Temperature: 0-50 Celsius Operating Humidity: Relative Humidity Less than 80% Power Supply: 1 * 6F22 9V Battery (NOT included) colour:black Material:ABS+ electronic components size:6 * 2.7 * 13.5cm Package Contents: 1 X Electromagnetic Field Radiation Tester 1 X English User Manual Only 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.