Testers & Meters

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Expected delivery: Wed, Nov 18

Electrical testers and meters for troubleshooting, maintenance and checking circuits. This section includes non-contact voltage testers, two-pole voltage testers, digital multimeters, clamp meters, receptacle and GFCI testers, continuity testers, circuit breaker finders, test leads and replacement meter fuses.

What to check before you order

  • CAT and voltage rating. Meters are rated by measurement category (CAT II, III or IV) and voltage. Choose one rated for the highest category and voltage where it will be used.
  • True RMS. True RMS meters read accurately on variable frequency drives and other nonsinusoidal loads. Average-responding meters can read wrong on those circuits.
  • Clamp jaw size and current type. Check that the jaw fits the conductor and whether you need AC only or AC and DC current.
  • Leads and fuses. Use leads rated to match the meter, replace damaged leads, and only use the replacement fuse type the meter maker specifies.

Testing energized equipment should be done by a qualified person following NFPA 70E and your site's electrical safety program. Lockout devices are under first aid, signs and lockout, and other gauges are in precision measuring and testing. See all electrical supplies.

Common questions

What does CAT III mean on a multimeter?

It is a measurement category from IEC 61010. CAT III covers distribution circuits inside a building, such as panels and feeders, and CAT IV covers the service entrance. At the same voltage, a higher category means more protection against voltage spikes.

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