A pocket sized electric field meter. Measuring 0-1000V/m true rms. Microprocessor controlled with a 10 bit A/D converter. Reading is updated every second. The EM-1 is calibrated to give the same result as an MPR 2 grade instrument (Item 160) when held 50cm distance from a VDU. An RS232 socket is incorporated to download data into the “terminal program” in ms windows.