Features: * 3 Axis probe. * Radio frequency electromagnetic field tester. * Wide measuring frequency ranges, 100 MHz to 3 GHz. * EMF-819 is used for broadband devices of monitoring the wide range radio frequency electromagnetic field value. * For precision measurement consideration, the meter is included one probe : EP-05H ( High frequency Probe, 100 MHz to 3 GHz ) * Unit : V/m, W/m^2, mW/cm^2. * Alarm setting function can warn the user if the measuring antenna is too near the strong radiation sources, the buzzer will sound to remind the user. * Peak hold function to latch peak value. * Data hold function to lock the current reading. * RS232 computer interface. * Hard carrying case is included. * Large size LCD with contrast adjustment, which can fit best viewing angle. * Microcomputer circuit provides special function & offers high accuracy. * Powered by 006P DC 9V battery or DC 9V adapter.