Features: Simple operation and highly sensitive. Can detect the power of electromagnetic radiation around homeelectronics, electric wire, industrial equipment and so on. Wide range of detectable frequency. Data hold function. Applications: For detecting environmental electromagnetic radiation:indoors, computer station room, industrial control room,electric wire, high voltage wire, monitors, etc. For detecting home electronics: cellphone, PC, TV set, copymachine, fax machine, microwaves, refrigerator and so on. NOTES: The dosimeter is for testing the electric field radiation. If the test equipment earthing shielded, the test would fail. Metal will shield the radiation, too. If the meter keeps display "0" while testing, please change a battery and test again. Specifications: Display readings: Three semi-liquid crystal display, maximumreading 1999 Housing: ABS Power 1 * 6F22 9V Battery (not included) Frequency Range: 50Hz~2000MHz Reacting time: 0.4S Color: Black Item dimension: 13.5 * 7.1 * 3.2cm/ 5.3 * 2.8 * 1.3in Item weight: 104g/ 3.66oz Package dimension: 16.5 * 11.3 * 4.6cm/ 6.5 * 4.4 * 1.8in Package weight: 110g/3.88oz Package list: 1 * Electromagnetic Radiation Detector 1 * Instructions