The Desco 19442 Digital Static Field Meter indicates surface voltage and polarity on objects. The Desco 19442 has a measurement range of 0 to ±19.99 kV at a distance of 1 inch and a measurement accuracy of ±5%. The Desco 19442 utilizes a chopper-stablized sensor for use in both normal and ionized environments. The Desco 19442's enclosure is dissipative and features a 7 mm snap and ground cord for bonding to equipment ground. The Desco 19442 rotary zero knob sets the zero-reference point with finely tuned precision, and a Hold button allows the user to "freeze" a displayed measurement for evaluation. The Desco 19442 LED range indicator assists with placing the meter at the correct distance from the object being measured. The Desco 19442 is calibrated to NIST standards and includes a certificate.