NIST-Traceable Calibration Services for Electrical, Mechanical, Electromechanical, and Electronic Measuring Instruments in Winston-Salem, NC

Electrical Test Instruments, LLC DBA ETI Precision (ETI) is a leader in the calibration and repair of test and measurement equipment, specializing in high-current and high-voltage instruments.

We provide onsite services in the Winston-Salem region, minimizing the downtime of your critical instruments by offering calibration services at your facility. Our NIST-traceable calibration services encompass a wide variety of electrical, mechanical, radio frequency (RF), pressure, physical-dimensional, and environmental instrumentation. For more information

We are an ISO 9001:2015-certified, ISO/IEC 17025:2017-accredited, and ANSI/NCSL Z540-1-1994-accredited calibration laboratory. We offer MIL-STD-45562A-compliant calibrations and calibrations in accordance with 10 CFR Part 21 and 10 CR Part 50 Appendix B upon request.

Contact us today
Phone: 410-857-1880

Just some of the products and services we offer our Winston-Salem customers:

  • Calibration of Test & Measurement Equipment
  • Digital Multimeter Calibration
  • Frequency Counter Calibration
  • DLRO Calibration
  • Ammeter & Shunt Calibration
  • Temperature Probe Calibration
  • Torque Wrench Calibration
  • Process Calibrator Calibration
  • Stopwatches & Timers
  • Sound Level Meter Calibration
  • IR Thermometer Calibration
  • Thermocouple Calibrator Calibration
  • Oscilloscope Calibration
  • Calibration of High Current – High Voltage Equipment:
  • High Voltage Detector Calibration
  • Power Quality Analyzer Calibration
  • Primary Injection Test Set Calibration
  • Earth Ground Tester Calibration
  • Secondary Test Set Calibration
  • Relay Test Set Calibration
  • Single & Three Phase TTR Calibration
  • AC and DC voltages above 100kV
  • Hipot Tester Calibration
  • Megohmmeter Calibration
  • Current & Potential Transformers
  • Power Supply Calibration


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ETI is the Premier Provider of NIST-Traceable Calibration Services for Electrical Test Equipment in and around Winston-Salem, NC

Testing companies trust in ETI to take care of the annual calibration programs of their electrical test equipment. Our NIST-traceable calibrations address meghommeters, power analyzers, power supplies, power factor test sets, multimeters, electrical clamps, recloser test sets, DLRO’s, circuit breaker testers, oscilloscopes, and a wide range of additional instruments. We can calibrate your instruments onsite at your location or offsite at ETI’s calibration laboratory. Customers in Winston-Salem, NC choose to have ETI come onsite for one-day turn-around of their test equipment with almost zero down time. When you mail your instruments in for service at our laboratory, we make every effort to deliver your equipment in a matter of five to eight business days. We also offer an expedite service for Winston-Salem customers that need to have quick turnaround of their equipment. ETI is an ISO 9001:2015-accredited calibration laboratory that is ANSI/NCSL Z540 and 10 CFR Part 50 Appendix B compliant. Universities, electrical contractors, Fortune 500 companies, utilities, data centers, nuclear energy facilities, electrical testing businesses, and municipalities of all sizes and shapes in Winston-Salem, North Carolina utilize ETI as an integral calibration partner.

ETI is a Top Provider of NIST-Traceable Calibration Services for Mechanical Instruments in Winston-Salem, NC

ETI offers NIST-traceable calibration services for a range of test equipment and mechanical measuring, including calipers, micrometers, tachometers, torque wrenches, infrared inspection equipment, IR cameras, pressure controllers, air pressure meters, oil pressure meters, temperature meters, stop watches, plus everything in between. We provide on-site calibration services in our customers’ business locations in Winston-Salem, North Carolina as well as service at our laboratory. Our onsite calibration customers in Winston-Salem enjoy same-day turnaround of their test equipment at their own facilities with minimal downtime. Our in-house calibration service supplies prompt industry-leading turnaround times of 5 to 8 business days, with a speed-up service offered to return your equipment to Winston-Salem as quickly as we can. ETI is an ISO 9001:2015-accredited calibration laboratory that is ANSI/NCSL Z540 and 10 CFR Part 50 Appendix B compliant. Data centers, municipalities, universities, utilities, Fortune 500 companies, acceptance testing businesses, nuclear energy facilities, and electrical contractors of all shapes and sizes in Winston-Salem rely on ETI to handle their mechanical test and measuring instrument calibration programs.

Test Equipment Repair Services for Winston-Salem Businesses

ETI repairs all major brands and models of electrical testing instruments. Regardless of whether your Winston-Salem facility’s instruments have been in service for decades or are brand new, our broad repair capabilities are able to extend the life of your most important testing equipment. ETI’s maintenance and repair services include analog instruments, digital instruments, lab instruments, panel meters, switchboard meters, multimeters, clamp-on meters, power quality meters, power analyzers, oscilloscopes, frequency counters, and a wide variety of additional mechanical and electrical test equipment. Every one of our repair services include NIST-traceable calibration of your equipment, in-depth documentation, competitive pricing, and a fast turnaround. Winston-Salem facilities rely on ETI to minimize their down time and repair their critical test instruments.

Manufacturing High-Quality Circuit Breaker Testers and Power Supplies for Customers All Over the Country

ETI produces and retails trusted electrical test equipment. Our Professionals provide services for circuit breaker testing instruments, which include circuit breaker test sets and power supplies. We are also the U.S. service center and reseller for the complete line of Metrel electrical test instruments and products.

Our product line of top quality low voltage high current circuit breaker test sets cater to the full spectrum of electrical testing companies’ requirements. Our primary injection circuit breaker testers range from 250A to 6,000 A continuous output, with instantaneous testing capabilities up to 60,000 A. Our PI-250B, PI-800, and PI-1600 test sets are lightweight, portable, durable, and modular while at the same time outperforming competing products’ capabilities at their price points. Our stationary PI-2500, PI-4000B, PI-5000, and PI-6000 circuit breaker test sets also lead the sector in reliability and capabilities for high current circuit breaker testing. All ETI circuit breaker testers feature our cutting edge MAC-21 controller, which is a self-contained microprocessor-based metering and control package for primary injection testing. We also retrofit other manufacturers’ circuit breaker test sets with our MAC-21 controller:

  • expanding their capabilities,
  • extending their useful lives,
  • and revamping the circuit breaker testing capabilities of our valued customers.

ETI’s high quality power supplies are lightweight, durable, and reliable. Our products are capable of outputting 7.2 A to 20A continuous at 140 VAC. ETI’s power supplies are perfect for circuit breaker charging motor testing.

As the United States reseller and authorized service center for Metrel , ETI is genuinely a one-stop shop for electrical testing companies’ instrument requirements. We sell and support the whole line of Metrel offerings, such as meghommeters, DLRO’s, and power analyzers. Our annual repair services and calibration programs on all products we manufacture and sell make ETI the go to partner of hundreds of electrical testing companies, universities, data centers, Fortune 500 companies, utilities, and municipalities across the country.`

Calibration and Repair Services in Winston-Salem


About Winston-Salem, NC

A Forsythe County city Winston-Salem has a population of 247,945. The city is home to the regions tallest building the Wells Fargo Center. Due to its heritage, Winston-Salem is referred to as the twin city. It earned the name camel city because of the camel cigarettes made by the locally situated RJ Reynolds tobacco company. It is considered as one of the best places to retire in the country. With restaurants, hotels, and apartments being under construction it is on the path of revitalization. Salem was a typical Moravian settlement. It was named shalom for peace initially which eventually became Salem. The city holds the world-famous Moravian sunrise service on Easter day each year. A new town was established in the north of Salem which came to be called Winston and later the two became the twin city. Winston was named after an American Revolutionary War hero Joseph Winston.

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ETI Precision – Electrical Test Instruments supports customers in Winston-Salem, North Carolina, including the following zip codes: 27023, 27040, 27045, 27101, 27102, 27103, 27104, 27105, 27106, 27107, 27108, 27109, 27110, 27113, 27114, 27115, 27116, 27117, 27120, 27127, 27130, 27150, 27152, 27155, 27157, 27198, 27199, 27284. Click here to return to our NC service area page.