Pen Type Non Contact Electromagnetic Field Radiation Detector Mini EMF Tester Meter Features: 1. For radiation hazard radius of loop undesirable three plug electrical in the electricity use. 2. For radiation hazard radius of all the two plug electrical in the electricity use. 3. For radiation hazard radius of high voltage transmission line tower. 4. For radiation hazard radius of using GSM mobile phone dialing. 5. Abnormal fluctuations of electromagnetic radiation in other environments. 6. As a primary detection tools for all kinds of electromagnetic radiation protective equipment. 7. It can not only measure the electromagnetic radiation from home appliances and computers, but also measure the radiation from mobile phones. 8. Easy to operate with easy one-hand operation, easy to carry and make field measurement.  Specification:  Condition: Item Type: Electromagnetic Radiation Detector Material: ABS Size: Approx. 145 x 20 x 20mm / 5.7 x 0.8 x 0.8in Power Supply: 1.5V(AAA)x 2 (Not included) Detect Range: ≥ 50uw/cm² Package List:  1 x Electromagnetic Radiation Detector Pen 1 x Instruction Note: 1.To replace the battery in time, so as not to cause the battery aging and liquid leakage, if not, the circuit board will be damaged. 2. When the voice alarm call before a weakened obviously, please pull out red back cover and replace the battery. 3. When detected excessive electromagnetic radiation, monitoring pen immediately issued a red flashing light, and the voice alarms continuously, until your environment achieves safe recovery static state detection.