Equipment calibration, repair & sales

Calibration Services

We come to you
Offering simplified on-site calibrations in all 50 states for electrical contractors, data centers, & more. Our unique capabilities include high-current & high-voltage equipment.
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Our Products

Precision equipment for industry
We build intuitive and rugged high-current circuit breaker testers and AC/DC variable power supplies. Our technical support team is readily available if you require assistance.
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Repair & Retrofit Services

Minimize downtime of critical instruments
We repair a wide range of electrical test equipment. Our retrofit services for high-current circuit breaker testers extend the productive life of these expensive & critical assets.
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ETI Precision
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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

Featured Product

PI-5000 Gen2
Portable and modular unit for testing 4,000A circuit breakers, maneuverable in tight spaces.
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40,000+
instruments calibrated across 41 states over the past year.
Electrical Test Instruments, LLC
D/B/A ETI Precision
8430 Spires Way, Suite A
Frederick, MD 21701
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Phone: 410-857-1880
Fax: 410-857-1387
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