Clamp meter
Fluke 323
Compact true-RMS clamp meter built around a slim jaw for crowded panels.
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Best for
Measuring current in a tight, densely packed load center
Specifications
| AC current | Up to 400 A via clamp |
|---|---|
| Measurement | True-RMS |
| Safety rating | CAT IV 300 V / CAT III 600 V |
Specifications as published by Fluke. Confirm against the current spec sheet before buying — manufacturers revise models without renaming them.
What's good
- Slim jaw gets around conductors the bigger meters cannot reach
- CAT IV 300 V rating covers service-entrance-adjacent work
- Small enough to carry constantly
What's not
- 400 A ceiling is lower than some rivals (still far beyond residential need)
- Fewer secondary functions than a combination clamp/multimeter
Our verdict
Buy on jaw access and safety rating, not on the current ceiling — no residential branch circuit comes close to 400 A. If your panel is full and the conductors are tightly dressed, the slim jaw is worth more than any spec on the box.
Compare with the alternatives
- Klein Tools NCVT-3P — confirming a circuit is dead before you open a device or box
- Fluke 1AC-A1-II VoltAlert — a simple, rugged live/dead check on 120 v and 240 v branch circuits
- Sperry Instruments GFI6302 — checking every outlet in a house quickly for miswiring
- Klein Tools RT250 — diagnosing voltage drop or a flaky circuit, not just wiring order
- Klein Tools ET310 — labeling a panel without two people and a lot of shouting
- Klein Tools MM400 — a first multimeter that will not be outgrown for home work
- Fluke 117 — anyone who will do this more than once a year
- Klein Tools CL800 — finding out what a circuit or appliance is actually drawing