The FMX-004 is a compact Electrostatic Fieldmeter used for locating and measuring static charges. Its pocket size and three-button operation makes it convenient and easy to use. It measures both positive and negative polarity charges up to ±30kV (30000V) at a distance of 1-inch. Results are simultaneously shown numerically and in bar graph format on the unique multi-coloured display that also displays battery charge status. Power ON/OFF, zero adjustment, Ion balance (MODE) and hold are all push button operation. The hold button allows the display to retain the static charge reading. This is especially useful where display is difficult to see during measurement. Two LED guide lights help position the field meter at the right distance from a charged test object. The conductive case and ground snap facilitate grounding for accurate measurement. The circuitry of the FMX-004 has been designed to make measurements in areas using air ionization.