Why ETI

Electrical Test Instruments is a leader in the calibration, repair, and sale of test and measurement equipment. Customer service sets us apart: every member of our team is committed to our customers’ success. We have been providing outstanding customer service with a relentless focus on quality since 1994.

High Caliber Service

Our team of experienced technicians is available where you need them to ensure you’re able to perform the work you do every day without interruption or delay. We view our customers as partners and go above and beyond to provide quick and reliable support. Whether it’s troubleshooting with your team over the phone, performing our nationwide calibration services, or repairing and retrofitting equipment, we strive to provide the highest level of service and support. Our internal culture of service carries over into all of our interactions.

Minimize Downtime
Our dedication to minimizing equipment downtime is evident in everything we do at ETI Precision. We offer simplified, onsite calibrations in all 50 states, minimizing the time your equipment is out of commission, keeping your projects on schedule and allowing you to best support your customers.

Comprehensive Solutions
At ETI Precision, our product and service offerings all work together toward the unified goal of promoting the safety and reliability of your test and measurement equipment. Our routine calibration services give you confidence in your measurements. Our rugged high-current circuit breaker testers and power supplies are built to last, keeping your team up and running. Lastly, ETI’s expansive instrument repair and breaker tester retrofit services extend the life of your critical equipment.

Accessible & Adaptable

When it comes to our products and services, we don’t overcomplicate them. Technicians find our products easy to use and our team is available to support you whether you use our products or not. Our focus is straightforward – deliver high performance, accuracy, and durability to our partners through our products and services.

Specializing in Nationwide Onsite Service

We come to you, minimizing the downtime of your critical instruments by offering calibration services at your facility. As a manufacturer of circuit breaker testers and ground-fault testing equipment, we have unique expertise and proprietary technology for calibrating high-current ammeters. We offer a broad range of capabilities within electrical, torque, pressure, physical, dimensional, RF, and microwave calibration services. ETI is also able to repair and retrofit a wide variety of test and measurement instruments. Our emergency onsite repair services are available for your urgent equipment issues.

Our company has worked with ETI for over twenty years, during this time we have found them to be a reliable source of calibration and repair services as well as a supplier for some of our test equipment. ETI routinely services over 1,500 assets at 10+ locations.

Schneider Electric

Manufacturing Rugged & Durable Breaker Testers

ETI is a reliable partner for high-current circuit breaker testers and ground fault testing equipment. Our rugged primary injection high-current circuit breaker testers are trusted by electrical testing companies and industry worldwide. We offer outstanding customer service, a two-year warranty on all new ETI products, and exceptional quality.

ETI prides itself on responsive customer service. Whether requiring technical assistance, product support, remote troubleshooting, or onsite service, our customers turn to ETI for their critical test and measurement instrument needs.

We support customers throughout the United States. Some of our most active service areas are MarylandPennsylvania, Virginia, New Jersey, Delaware, Alabama, Florida, Georgia, Kentucky, North Carolina, South Carolina, Tennessee and West Virginia.


Electrical Test Instruments, LLC
D/B/A ETI Precision
8430 Spires Way, Suite A
Frederick, MD 21701



Phone: 410-857-1880
Fax: 410-857-1387
Email us

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