Guide · updated 10 November 2026
How to Test Continuity with a Multimeter
To test continuity, switch the circuit off and isolate the part, turn the multimeter dial to the continuity symbol (it looks like a sound wave, often shared with the diode symbol), and touch the probes to the two ends of the wire, switch or fuse. If the path is complete the meter beeps and shows a low resistance. If it is open the meter stays silent and shows OL. Continuity only tells you that a path exists, not that it is good enough for the current it must carry.
iPhone and iPad (iOS 17 or later): free on the App Store. Android later.
Safety first
Safety. Switch the circuit off and isolate it from power and from the battery before you test. Never test continuity or resistance on a live circuit: it can damage the meter and hurt you. Discharge any capacitor first (through a resistor, not with a screwdriver). Use a meter whose CAT rating and fuse fit the place you are working.
The continuity symbol
On most multimeters continuity shares a dial position with ohms or with the diode test, marked with a sound-wave or speaker symbol. A button (often SELECT or FUNC) steps between the functions sharing that position. When the symbol shows on the display, the meter is in continuity mode.
What you need
- A multimeter with a continuity mode, such as the OWON OW18B, and two probes in good shape.
- The circuit or part, switched off and isolated.
- Good access to both ends of the path.
Steps
- Switch off and isolate the circuit. Unplug the equipment, and disconnect the battery if there is one.
- Put the black probe in COM and the red probe in the V/Ω jack.
- Turn the dial to the continuity symbol. If the position is shared, press the function button until the symbol shows.
- Touch the two probe tips together. The meter should beep and show a value near zero. That is your own lead resistance, and it proves the meter and leads work.
- Touch the probes to the two ends of the path you are testing. Press firmly on clean metal.
- Read the result: a beep and a low value mean continuity, silence and OL mean an open path.
- Wiggle the wire or connector gently while you watch. A reading that flickers points to a loose or broken conductor.
What the reading means
Thresholds are typical and meter-dependent; check your meter's manual.
| Result | Typical meaning |
|---|---|
| Beep, under about 1 Ω | A short, solid path: wire, closed switch, good fuse |
| Beep, a few ohms up to the meter's threshold | Complete but resistive: a long thin wire, a worn contact, a dirty joint |
| OL | Open: a break, an open switch, a blown fuse |
Many meters beep below a threshold somewhere between about 20 Ω and 50 Ω. Others use a fixed or a selectable value. A beep therefore does not mean low resistance in the sense a power circuit needs. When the number matters, switch to the ohms range and read it.
Common mistakes
- Testing a live circuit. Continuity and resistance modes expect no voltage. Power off first.
- Testing a path with parallel branches. Other components wired across the part give a false beep. Disconnect one end of what you test.
- Leads in the wrong jacks, for example the red lead left in the current jack.
- Trusting the beep for a high-current job. A thin damaged wire can beep and still overheat under load.
Log the result with a Bluetooth meter
If you have to record continuity checks, a Bluetooth meter and the app save you the notebook. The app reads the meter live, and one tap saves the reading with a note or photo. Hold freezes a reading you cannot hold the probes on any longer. If your meter is not one the app reads, type the value in; it is marked as manual. Export the session as CSV. See quick capture and hold, REL, min and max. A test file is your record, not a certification.
What the app does here, and what it doesn't
| What it does | Plan |
|---|---|
| Type the reading from any instrument; typed values are marked as manual. | Free |
| Hold freezes the displayed reading and statistics in the app, independent of the meter's own HOLD. | Free |
| REL shows the difference from a stored reference, for example to null out test-lead resistance. | Free |
| One tap saves the current reading, with an Undo. | Free |
| Export log sessions and test files as CSV, free. | Free |
Not yet, or not planned
- A test file is your record, not a certification.
Questions
What is the multimeter continuity symbol?
A small sound-wave or speaker icon, often printed next to the diode symbol on the same dial position. A button on the meter switches between them.
Does a beep mean the wire is good?
It means a path exists below the meter's threshold. It does not show that the wire can carry its rated current. For that, read the resistance in ohms and compare it with the limit for your job.
Try it in the demo
A simulation of the app in your browser, with made-up readings: no meter and no install needed.
Get TestNMeasure for iPhone and iPad.
iPhone and iPad (iOS 17 or later): free on the App Store. Android later.
Questions or a meter to suggest? Mail support@testnmeasure.app.
No ad networks, no sign-up.