NIST-Traceable Calibration Services for Electrical, Mechanical, Electromechanical, and Electronic Measuring Instruments in Durham, 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 Durham 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 Durham customers:

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


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We Support Durham Facilities with NIST-Traceable Electrical Test Equipment Calibration Services

ETI offers NIST-traceable calibration services for a variety of electrical test equipment, including megohmmeters, multimeters, oscilloscopes, electrical clamps, DLRO’s, circuit breaker testers, power factor test sets, recloser test sets, power supplies, power analyzers, and everything in between. We present both onsite calibration support services at our customers’ locations. Our onsite calibration customers in Durham reap the benefits of same-day turn-around of their test equipment at their own facilities with a minimum of downtime. ETI is an ISO 9001:2015-accredited calibration lab that is ANSI/NCSL Z540 and 10 CFR Part 50 Appendix B compliant. Municipalities, electrical testing businesses, nuclear energy facilities, Fortune 500 companies, electrical contractors, data centers, universities, and utilities of many sizes and shapes in Durham, NC depend on ETI to manage their electrical test equipment calibration programs.

Supporting Durham Facilities with NIST-Traceable Mechanical Test Equipment Calibration Services

Electrical Test Instrument’s NIST-traceable calibrations of mechanical measuring and test equipment are relied upon by testing businesses throughout the U.S. The instruments we support include calipers, micrometers, tachometers, torque wrenches, infrared inspection equipment, IR cameras, pressure controllers, air pressure meters, oil pressure meters, temperature meters, stopwatches, and everything in between. Our experts are skilled in the onsite calibration of mechanical equipment at our customers’ locations in Durham, NC. Our team also offers a mail-in choice to service your critical mechanical test equipment in our calibration lab. Onsite calibration services in Durham is an economical and convenient option for local customers who wish to curtail their downtime. 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 sizes in Durham count on ETI to oversee their mechanical test and measuring instrument calibration programs.

How We Extend the Life of Critical Test Equipment in Durham, North Carolina with our Professional Repair Services

ETI fixes all of the major brands and models of electrical testing instruments. Whether your Durham facility’s instruments have been in service for many years or are recent to your company, our broad repair capabilities are able to lengthen the lifespan of your essential testing equipment. ETI’s repair services include clamp-on meters, power quality meters, oscilloscopes, lab instruments, power analyzers, digital instruments, frequency counters, switchboard meters, analog instruments, multimeters, panel meters, and a wide range of additional mechanical and electrical test equipment. Every one of our repair services feature NIST-traceable calibration of your equipment, detailed documentation, competitive rates, and a fast turnaround. Durham facilities rely on ETI to lessen their down time and repair their critical test instruments.

We Manufacture High-Quality Circuit Breaker Testers and Power Supplies for Facilities Around the Nation

ETI produces and retails industry-leading electrical test equipment. Our Professionals specialize in circuit breaker testing instruments, which include circuit breaker test sets and power supplies. We are also the United States reseller and service center for the complete line of Metrel electrical test instruments and products.

Our line of top quality low voltage high current circuit breaker test sets cater to the full spectrum of electrical testing companies’ needs. Our primary injection circuit breaker testers range from 250A to 6,000 A continuous output, with instant testing capabilities up to 60,000 A. Our PI-250B, PI-800, and PI-1600 test sets are portable, lightweight, durable, and modular while 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. Additionally, we 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 highly valued clients.

ETI’s top notch power supplies are lightweight, durable, and dependable. Our instruments are capable of outputting 7.2 A to 20A continuous at 140 VAC. ETI’s power supplies are optimal for circuit breaker charging motor testing.

As the U.S. authorized service center and reseller for Metrel products, ETI is undeniably a one-stop-shop for electrical testing companies’ instrument needs. We support and sell the complete line of Metrel products, including DLRO’s, megohmmeters, and power analyzers. Our yearly repair services and calibration programs on every product we manufacture and sell make ETI the trusted partner of hundreds of electrical testing companies, data centers, universities, Fortune 500 companies, utilities, and municipalities across the country.

Calibration and Repair Services in Durham


About Durham, NC

A Durham county city Durham has a population of 278,993. First established as a depot for the railroad needs of wood and water. The land for this was donated by Dr. Bartlett S Durham. The city is named after him. Tobacco was a thriving industry here and contributed greatly to its economic progress and the city’s development. It was the founding place of the American tobacco company. Other industries that thrived here are textiles and electric power. After revitalization now it is a medical, educational, and research center. The city was called the Flower of the Carolinas by John Lawson a poet while describing the beauty of the city. It was home to large plantations like Hardscrabble, Leigh, Lipscomb, and so on. African slaves working on the plantations here developed some cultural traditions that involved life rituals, crafts, music, and more. It had a role in the American civil war.

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ETI Precision – Electrical Test Instruments supports customers in Durham, North Carolina, including the following zip codes: 27517, 27560, 27701, 27702, 27703, 27704, 27705, 27706, 27707, 27708, 27709, 27710, 27711, 27712, 27713, 27715, 27717. Click here to return to our NC service area page.