Clamp meter
Fluke 323
Compact true-RMS clamp meter built around a slim jaw for crowded panels.
We earn a commission if you buy through links on this page, at no extra cost to you. It does not change what we recommend — see our affiliate disclosure. As an Amazon Associate I earn from qualifying purchases.
Best for
Measuring what a hardwired circuit actually draws, even in a crowded panel
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
- Reads one conductor at a time — clamped around a whole cord or cable it shows close to zero
- AC current only, and 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
- Fluke 117 — anyone who will do this more than once a year