Multimeters
Multimeters measure voltage, current, and resistance in a single handheld or benchtop instrument, making them one of the most widely used tools in electrical and electronics work. We stock digital multimeters (DMMs) for field service, industrial maintenance, and laboratory bench use.
Types of Multimeters
Handheld digital multimeters offer portability for field service, troubleshooting, and general electrical work, with models rated for different CAT safety categories depending on the voltage environment. Benchtop multimeters provide higher accuracy and resolution for lab and calibration use, typically with data logging and remote interface capability. True-RMS multimeters accurately measure AC voltage and current on non-sinusoidal waveforms, which is important for variable frequency drives, electronic ballasts, and other non-linear loads.
Accuracy & Resolution
Basic accuracy in this category ranges from around 0.5% on general-purpose handheld models down to 0.02% or better on precision benchtop multimeters used for calibration reference work. Resolution, measured in counts (such as 6000-count or 50,000-count display), determines how fine a measurement the meter can display.
Safety Ratings (CAT Ratings)
CAT ratings (CAT II, CAT III, CAT IV) indicate the level of transient voltage protection a multimeter provides, based on where in an electrical system it will be used — CAT IV for utility connections and service entrances, CAT III for distribution panels and fixed equipment, and CAT II for general receptacle-level work. Choosing the correct CAT rating for your work environment is a safety requirement, not just a spec preference.
Common Applications
- Electrical troubleshooting and maintenance
- Industrial and facility electrical testing
- Automotive and equipment diagnostics
- Calibration lab reference measurement
- Electronics design and prototyping
Not sure which multimeter fits your application? Contact our team — we can help match accuracy, CAT rating, and features to your specific requirement.
Frequently Asked Questions
What CAT rating do I need for my multimeter?
CAT rating should match where you’ll be working in the electrical system — CAT III is common for distribution panels and industrial equipment, while CAT IV is required for utility-level connections. Using an underrated meter in a high-energy environment is a safety hazard.
Do I need a True-RMS multimeter?
True-RMS multimeters are recommended when measuring AC voltage or current on non-sinusoidal waveforms, such as those found with variable frequency drives or electronic devices, since standard averaging meters can give inaccurate readings on these signals.
What’s the difference between a handheld and benchtop multimeter?
Handheld multimeters offer portability for field and general troubleshooting work. Benchtop multimeters provide higher accuracy and resolution, better suited for lab, calibration, and stationary bench testing.
Do you provide calibration certificates for multimeters?
Yes, select models are available with a NIST-traceable calibration certificate at the time of purchase. Look for the certification filter above or contact us for a custom calibration request.