Simco Ion Electrostatic Field Meter (FMX-003)
The upgraded unit, FMX-004, is available here: http://www.hmcelectronics.com/product...
The Simco FMX-003 has been replaced by the upgraded FMX-004. It is a convenient, compact and pocket-sized electrostatic field meter. This compact, portable instrument measures positive and negative polarity electrostatic charges.