GM3120 Electromagnetic Radiation Detector Tester Phone PC Home Equitment Radiation Monitoring Electric Field Radiation and Magnetic Field Dual-mode with LCD Display 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 automatica Data locking, one-key lock of the radiation value. LCD display of the values for easier reading. Product From China (KK691)