Features: Accurate Detection: The EMF detector features sensitivity and precisions with a built-in magnetic radiation sensor, which displays radiation values on the digital screen after processing by a chip. Automatic shutdowns after 5 minutes of inactivity. Large and backlit screen is clear for viewing. Indicates when in low battery, and resets. Wide Application: The electromagnetic radiation tester is used for radiation test of TV, computer, printer, microwave oven, refrigerator, phone tower, low frequency electrical appliance and EMF Meter. Two Uses: An instrument with two uses, the EMF meter can test the electric field and the magnetic field radiation at the same time. Keep Good Health: Special function 5 LED indicators, which represent different radiation values. The radiation detector will keep you away from radiation, which is good for your health. Specifications: Material: ABS Range: 0-20+mG5% Application: 50/60Hz Frequency Monitoring Power Supply Mode: Dry Battery 9V 6F22(Shipping WITHOUT Battery) Light Color: Dark Green: 0 to 1.5 milligauss Green: 1.5 to 2.5 milligauss Yellow: 2.5 to 10 milligauss Orange: 10 to 20 milligauss Red: 20+ milligauss Size: Approx. 150x55x30mm/5.91x2.17x1.18in Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Electromagnetic Radiation Detector