Our Maryland Technical Staff Has Hands-On Experience Working With a Wide Range of Electrical and Mechanical Instruments. We Provide Quality Service and Support You Can Rely On

Electrical Test Instruments, LLC (ETI) is a leader in the calibration, repair, and manufacturing of electrical test equipment. We specialize in NIST-traceable calibration services for a variety of electrical test equipment and mechanical measuring instruments, including meghommeters, multimeters, clamps, torque wrenches, DLRO’s, circuit breaker testers, power factor test sets, recloser test sets, power supplies, power analyzers, and everything in between.

ETI provides both onsite calibration services at our Maryland customers’ facilities as well as in-house service at our calibration laboratory. Our onsite calibration customers enjoy same-day turnaround of their test equipment at their own facilities with minimal downtime. Our in-house calibration service provides fast industry-leading turnaround times of five to eight business days, with an expedite service available to turn your equipment around within three days.

ETI is ISO 9001:2015 accredited, ANSI/NCSL Z540 compliant, and 10 CFR Part 50 Appendix B compliant, making us the clear choice for electrical testing businesses, municipalities, data centers, nuclear energy facilities, utilities, universities, Fortune 500 companies, and electrical contractors of all shapes and sizes.

We also manufacture circuit breaker testing equipment. Our primary injection circuit breaker test sets range from 250A to 6,000A continuous output, with capabilities for instantaneous testing up to 60,000A. ETI’s power supplies are ideal for circuit breaker charging motor testing. We are also the United States reseller and service center for Metrel products, including DLRO’s and meghommeters, making ETI a one-stop shop for your electrical testing needs.

Finally, our capabilities include high-quality repair services that can extend the life of your critical test equipment. ETI can help you solve your most complex and urgent test equipment challenges.

Just some of the products and services we offer our Maryland customers:

  • Pressure Calibration
  • Clamp Calibration
  • Mechanical Instrument Calibration
  • Test Equipment Calibration Services
  • NETA Calibration
  • Portable Current Power Supply
  • Test Equipment Calibration
  • Circuit Breaker Test Set Calibration
  • High Current Digital Ammetter Retrofit
  • Electric Equipment Repair
  • Multimeter Calibration
  • Portable Circuit Breaker Tester
  • Electronic Test Equipment Calibration Services
  • AC-DC Variable Power Supply
  • Portable Circuit Breaker Test Set
  • Adjustable Test Stab System
  • Electrical Calibration Services
  • Test Equipment Repair
  • Acceptance Testing Calibration
  • PEARL Calibration
  • Electrical Meter Calibration
  • Torque Calibration
  • Meter Calibration Services
  • Mobile Circuit Breaker Test Set
  • Digital Multimeter Calibration
  • Circuit Breaker Tester Calibration
  • Oscilloscope Calibration
  • Electric Meter Calibration


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Supporting Maryland Facilities with NIST-Traceable Electrical Test Equipment Calibration Services

ETI specialises in NIST-traceable calibration services for various types of electrical test equipment, including power factor test sets, recloser test sets, circuit breaker testers, meghommeters, electrical clamps, multimeters, power supplies, DLRO’s, power analyzers, oscilloscopes, and everything in between. We provide onsite calibration support services in our clients’ facilities in Maryland, in addition to service at our calibration laboratory. Our onsite calibration customers in Maryland experience same-day turn-around of their test equipment at their own facilities with a minimum of downtime. Our in-house calibration assistance provides speedy industry-leading turnaround times of five to eight business days, with an expedite service available to return your facility’s equipment to Maryland as quickly as possible. 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, electrical testing businesses, municipalities, utilities, data centers, Fortune 500 companies, and nuclear energy facilities of many sizes and shapes in the Maryland Area rely upon ETI to manage their electrical test equipment calibration programs.

ETI is a Well Known Provider of NIST-Traceable Calibration Services for Mechanical Instruments in Maryland

Electrical Test Instrument’s NIST-traceable calibrations of mechanical measuring and test equipment are used by testing businesses nationwide. The mechanical instruments we support include oil pressure meters, micrometers, infrared inspection equipment, stop watches, pressure controllers, calipers, temperature meters, torque wrenches, tachometers, IR cameras, air pressure meters, and everything in between. We are skilled in the onsite calibration of mechanical equipment at our clients’ facilities in Maryland. Our company also offers a mail-in option to service your critical mechanical test equipment at our in-house calibration lab. Calibration services in Maryland is a cost-effective and hassle-free option for nearby customers who want to minimize their down time. Our mail-in alternative provides prompt turnaround times of five to eight business days, making sure that our customers in Maryland get their critical equipment serviced promptly. 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 various shapes and sizes in Maryland rely on ETI to oversee their mechanical test and measuring instrument calibration programs.

Test Equipment Repair Services for Maryland Organisations

ETI repairs all major brand names and models of electrical testing instruments. Whether your Maryland facility’s instruments have been in service for many years or are recent to your company, our broad repair capabilities can prolong the lifespan 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 electrical and mechanical test equipment. Every one of our repair services feature NIST-traceable calibration of your equipment, thorough documentation, competitive pricing, and a speedy turnaround. Maryland facilities turn to ETI to minimize their down time and mend their critical test instruments.

We Manufacture Premium Circuit Breaker Testers and Power Supplies for Clients Across the USA

ETI makes and retails industry-leading electrical test equipment. Our Professionals provide services for circuit breaker testing instruments, including circuit breaker test sets and power supplies. In addition, we are the U.S. reseller and service center for the entire line of Metrel electrical test instruments and products.

Our product line of top quality low voltage high current circuit breaker test sets serve the entire spectrum of electrical testing companies’ necessities. 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 modular, portable, durable, and lightweight whilst outperforming competing products’ capabilities at their price points. Our stationary PI-2500, PI-4000B, PI-5000, and PI-6000 circuit breaker test sets also best the industry in capabilities and reliability for high current circuit breaker testing. All Electrical Test Instrument circuit breaker testers feature our state-of-the-art MAC-21 controller, a self-contained microprocessor-based metering and control package for primary injection testing. In addition, 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 customers.

ETI’s high quality power supplies are light-weight, durable, and reliable. Our product lines are capable of outputting 7.2 A to 20A continuous at 140 VAC. ETI’s power supplies are ideal for circuit breaker charging motor testing.

As the United States reseller and authorized service center for Metrel , ETI is truly a one-stop shop for electrical testing companies’ instrument requirements. We support and sell the complete line of Metrel products, which include DLRO’s, meghommeters, and power analyzers. Our annual repair services and calibration programs on every product we make and sell make ETI the trusted partner of hundreds of electrical testing companies, data centers, universities, Fortune 500 companies, utilities, and municipalities nationwide.

About Maryland

Maryland is a state in the Mid-Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east. Maryland has an estimated population of 5,773,552 as of 2010. Maryland is often called “America in miniature” for its varied landscape, from mountains to its winding Atlantic coastline. The largest body of water in Maryland is the Chesapeake Bay, but we also have nearly 50 rivers and creeks, plus streams, lakes, ponds and the Atlantic Ocean. Maryland is the leading producer of blue crabs and is renowned for its crab cakes.

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Electrical Test Instruments supports customers in Maryland, including the following zip cities: New Windsor, Frederick, Baltimore, Towson, Annapolis, Gaithersburg, Hagerstown, Columbia, Silver Spring. Click here to return to our USA service area page.