2 Automotive DC Clamp Meters: Choose by Accuracy or Jaw Size

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Which DC clamp meter fits the current range and conductor size of your automotive task? The Fluke 325 has DC-current accuracy of 2% plus 5 digits.

Product	Maximum DC clamp current
Fluke 325	400.0A maximum
Klein Tools CL390	Up to 400A

1. Fluke 325

Best for DC-current accuracy

The Fluke 325 measures AC and DC current through its clamp on 40.00A and 400.0A ranges; its DC-current accuracy is 2% plus 5 digits. Its maximum wire diameter is 30 mm, so the conductor being clamped must be no larger than that.

Before ordering, confirm the current ranges and DC accuracy match your task. Also confirm the conductor you need to clamp is no larger than 30 mm.

Fluke 325

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2. Klein Tools CL390

Best for 1.6-inch jaw size

The Klein Tools CL390 measures AC and DC current through its clamp up to 400A and has a jaw size of 1.6 in (4.1 cm). DC microamps are measured through test leads, not the clamp.

Klein Tools CL390

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Which should you choose?

• Fluke 325: Choose it for DC checks where its 40.00A range and 2% plus 5 digits accuracy fit; the clamped wire must be 30 mm or less.
• Klein Tools CL390: Choose it when its 1.6-inch jaw size is the deciding detail; like Fluke, it clamps DC current up to 400A.