DESCO 19492 Digital Static Field Meter, -19.99kV Power Supply Portable meter for testing of electrostatic fields: measures surface voltage and polarity on objects up to +/-19.99 kV at a distance of 1" Durable dissipative housing design with membrane switches; protects meter from physical damage and minimizes wear LED range finder; red ranging lights help operator to place the meter at the correct distance from the object being measured Hold button allows the measurements to be retained for easy reading, and extends battery life Made in America