Desco 19442 — Digital Static Field Meter | ±19.99 kV | NIST Calibrated | Made in USA The Desco 19442 is a professional digital electrostatic field meter designed for measuring static charge and polarity on objects and surfaces in ESD-sensitive manufacturing environments. It measures up to ±19.99 kV at a distance of 1 inch with high accuracy, using a chopper-stabilized sensor that delivers reliable readings in both normal and ionized environments. NIST-calibrated from the factory, the 19442 is the standard tool for ESD audits, ionizer verification, and static field surveys per ANSI/ESD S20.20 programs. Part Number: 19442 | Range: ±19.99 kV | Measurement Distance: 1 inch | NIST Calibrated | Made in USA. Specifications Part Number 19442 Measurement Range ±19.99 kV Measurement Distance 1 inch (25 mm) from object surface Sensor Type Chopper-stabilized electrostatic sensor Display Digital with polarity indication Range Indicator LED distance indicator Zero Control Rotary zero knob for precise zero-reference setting Hold Function Yes — retains measurement for easy reading; extends battery life Enclosure Static dissipative with 7mm ground snap Grounding Ground cord included; grounds when held by grounded operator Calibration NIST-traceable calibration certificate included Compatible Accessories Desco 19443 Ionization Verification Kit; Desco 19441 Aluminum Conductive Plate Origin Made in USA Manufacturer Desco Industries Key Features Chopper-stabilized sensor — delivers accurate, drift-free electrostatic field measurements in both normal and ionized environments; eliminates zero-drift errors common in non-chopper designs ±19.99 kV measurement range — covers the full range of static charge levels encountered in electronics manufacturing, from low-level dissipation verification to high-charge-generating processes LED range indicator — assists the operator in maintaining the correct 1-inch measurement distance from the object being measured for consistent, repeatable readings Rotary zero knob — allows precise manual zero-referencing for accurate baseline measurements in varying ambient conditions Hold button — freezes the displayed reading for easy logging; also reduces power consumption to extend battery life during paused measurement sessions Dissipative enclosure with 7mm ground snap — the meter body is static dissipative; grounds automatically when held by a grounded operator or connected via the included ground cord NIST-traceable calibration — ships with a calibration certificate traceable to NIST; original certificate can be downloaded from Desco’s calibration portal for audit documentation Ionizer verification capable — upgradeable with the Desco 19443 Ionization Verification Kit to measure ionizer balance (offset voltage) and discharge times per ANSI/ESD S20.20 Made in USA — manufactured in the United States Industries & Applications Electronics manufacturing — ESD audits, static field surveys, and workstation verification in ANSI/ESD S20.20 programs Semiconductor fabrication — measuring surface charge on wafers, reticles, and process equipment Cleanroom environments — static field measurement on surfaces, equipment, and personnel in ISO-rated areas Ionizer verification — measuring ionizer balance and confirming ionization performance at the point of use Medical device manufacturing — ESD control verification in regulated assembly environments Quality and reliability labs — characterizing static generation on materials, processes, and packaging Compatible Accessories Desco 19443 — Ionization Verification Kit: provides accessories for testing ionizer balance (offset voltage) and discharge times Desco 19441 — Aluminum Conductive Plate Accessory: enables measurement of ionizer balance (offset voltage) Frequently Asked Questions What does a chopper-stabilized sensor do, and why does it matter? A chopper-stabilized sensor uses a mechanical or electronic chopper to modulate the electrostatic field signal before amplification, eliminating DC offset and zero-drift errors. This results in highly accurate, stable readings even in ionized environments where non-chopper field meters can give erratic or drifting readings. For ESD audits requiring precision measurement, a chopper-stabilized design is the professional standard. How do I use the Desco 19442 to verify ionizer performance? The 19442 can verify ionizer performance when paired with the Desco 19443 Ionization Verification Kit or the 19441 Aluminum Conductive Plate. Hold the meter at 1 inch from the charged plate, zero the meter, then measure the ionizer’s balance (offset voltage) and time the discharge from a known charge level to confirm performance meets ANSI/ESD S20.20 ionizer requirements. Does the 19442 come with a calibration certificate? Yes — the Desco 19442 ships NIST-calibrated with a calibration certificate traceable to the National Institute of Standards and Technology. The original calibration certificate can be downloaded directly from Desco’s website for record-keeping and audit documentation purposes. What is the correct measurement distance for the 19442? The 19442 is designed to be used at exactly 1 inch (25 mm) from the surface being measured. The built-in LED range indicator helps the operator maintain this distance consistently. Deviating from the 1-inch measurement distance will result in inaccurate readings, as field strength varies with distance.
