Equipment calibration, repair & sales

Calibration Services

We come to you
Specializing in nationwide onsite calibration services for electrical testing companies, data centers, municipalities, power generation facilities, universities, and beyond.

Our Products

Precision instruments for industry
Rugged, durable, and intuitive test equipment for electrical testing companies. ETI is a leader in high-current ammeters, circuit breaker testers, and AC/DC variable power supplies.

Repair & Retrofit Services

Minimize downtime of critical instruments
ETI repairs hundreds of varieties of electrical test equipment and upgrades high-current circuit breaker testers with advanced digital control packages.
ETI Precision

Potomac Testing has been using ETI for over 25 years. We rely on them for all of our calibrations and repairs, ensuring our equipment is maintained properly and compliant with NETA and PEARL requirements. ETI provides our team with the best customer service available.

Potomac Testing
26,000+
instruments calibrated across 38 states over the past year.

Electrical Test Instruments, LLC
8430 Spires Way, Suite A
Frederick, MD 21701


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

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