The Desco 19492 Digital Static Field Meter indicates surface voltage and polarity on objects. The meter can measure ranges of 0 to ±1.999 kV or 0 to ±19.99 kV at a distance of 1 inch with an accuracy of ±5% of the displayed value. The automatic zero button allows adjustment to zero with no screws or dials to turn. The hold button allows the user to "freeze" a displayed measurement for evaluation. A LED range finder helps the operator to place the meter at the correct distance from the surface being measured. The meter will automatically turn off after 20 minutes to conserve battery power (9V). The Digital Static Field Meter is calibrated with accepted procedures and standards traceable to NIST.