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A clamp meter measures current without breaking the circuit. Electrical work can be dangerous. Always follow the instructions, use the right safety rating for the job and call a licensed electrician if you are unsure.
Last updated: October 31, 2026.
Choose the Function
Select AC amps (or DC if supported). See best clamp meters.
Clamp One Conductor
Clamp around one wire only; clamping a cable with both wires cancels the reading.
Read the Display
Wait for a stable value and use hold if needed.
Safety
Use a meter with the right CAT rating and keep fingers behind the jaws guard. See CAT ratings.
Frequently Asked Questions
Why is my reading zero?
You may have clamped both wires.
Can it measure DC?
Only some models.
Is it accurate?
Within the spec.
Bottom Line
Clamp one conductor at a time and respect the safety rating.
