The manual stresses that the sensor grid (the gold-colored mesh at the top) is delicate. Do not touch it or blow compressed air directly into it.
: Measures static charges up to $\pm$20 kV (20,000V). simco fmx-002 manual
: Measures offset voltage up to $\pm$200V by attaching an optional metal ion balance plate. The manual stresses that the sensor grid (the