A multimeter measures voltage, current and resistance, and many also check continuity. Digital models are easiest for most people, and auto-ranging ones select the scale for you. Because electricity is hazardous, this guide offers general advice only: read the maker’s manual, follow local rules and call a qualified person for mains work.
Analog or Digital
Analog meters use a moving needle and can show trends at a glance, but they take more skill to read. Digital meters show a number, which is clearer for beginners. Most home workshops choose digital for its simple display.
Useful Features
- Auto-ranging: the meter selects a suitable range, reducing the chance of setting errors.
- Continuity beeper: sounds when a circuit is complete, handy for checking fuses and cables.
- Backlit display: helps in dim spaces.
- Hold function: freezes a reading so you can look at it away from the probes.
- Protective holster: helps the meter survive bumps on the bench.
Comparing Meters
| Factor | Why it matters | What to check |
|---|---|---|
| Category marking | Shows the environments the maker designed it for | Read the marking and the maker’s guide for permitted use |
| Measurement range | Needs to cover the values you meet | Compare against your typical tasks, such as batteries or small circuits |
| Leads | Damaged leads can mislead or be hazardous | Check insulation and tips are intact |
| Fuses | Protect the meter’s current circuits | Confirm replacement fuse type in the manual |
| Display | Needs to be readable | Check digit size and contrast |
A Simple Battery Check
- Inspect the meter and leads for cracks or exposed metal. Do not use damaged equipment.
- Plug the black lead into the common socket and the red into the voltage socket.
- Turn the dial to the DC voltage setting suited to the battery.
- Touch the red probe to the positive end and the black to the negative end.
- Read the display and compare it with the figure printed on the battery or in its guide.
Cautions
Never measure voltage or resistance in a way the manual does not allow, and never use a meter on circuits above its stated limits. Keep fingers behind the probe guards. Mains wiring should be handled by a qualified person following local rules. Nothing in a general guide promises protection.
A few practical habits go a long way. Turn the dial to the off position when you finish. Replace worn leads rather than repairing them with tape. Check that the battery inside the meter is in good condition before relying on a reading, because a weak battery can show odd numbers. Keep the manual close to the meter for reference.
FAQ
Do I need a true-RMS meter?
It matters for certain non-standard waveforms. Basic battery and continuity checks do not usually need it.
How do I know the meter is accurate?
Check against a known source, such as a fresh battery, and follow the maker’s guidance on service.
The Short Version
Choose a digital meter with a clear display and the features you will use. Check the category marking and leads, and keep to the limits in the manual. Follow local rules and ask a qualified person for mains work.