Hand held meter measures presence intensity and polarity of electrostatic charges up to 30,000 volts (accuracy ±10%). Features two ranges for accurate measurements of 0-500V at 0.5", 0-3000V at 4", and 0-5000V at 0.5", 0-30,000V at 4". A "zero-switch" function instantly re-zeroes the instrument for repetitive measurements. Comes complete with battery, case, 1-year warranty and comes with a certificate of calibration.