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Fluke
Fluke 323 True-RMS Clamp Meter
$207.99
Best Clamp Meters · head-to-head
Fluke 323 True-RMS Clamp Meter vs Extech MA640 True RMS AC/DC Clamp Meter with NCV
A sourced, side-by-side comparison. Fluke 323 True-RMS Clamp Meter is cheaper at $207.99. Every spec and price links to its source.
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Extech (Teledyne FLIR)
Extech MA640 True RMS AC/DC Clamp Meter with NCV
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Fluke 323 True-RMS Clamp Meter | Extech MA640 True RMS AC/DC Clamp Meter with NCV |
|---|---|---|
| US price | $207.99 | — |
| Brand | Fluke | Extech (Teledyne FLIR) |
| Released | — | — |
| Ac current range | 400.0 A, 2.0% ±5 digits (45-65 Hz) / 2.5% ±5 digits (65-400 Hz) | 60.00 A / 600.0 A |
| Dc current range | — | 60.00 A / 600.0 A |
| Jaw opening | 30 mm (600 MCM) | 1.5 in (40 mm), conductors up to 500 MCM |
| Ac dc voltage range | 600.0 V AC (1.5% accuracy) / 600.0 V DC (1.0% accuracy) | AC 6.000V/60.00V/600.0V; DC 600.0mV/6.000V/60.00V/600.0V |
| True rms | Yes | Yes |
| Resistance continuity | 400.0/4000 Ω, 1.0% accuracy; continuity beeper ≤70 Ω | 600.0Ω to 60.00MΩ, with continuity |
| Capacitance | — | 40.00nF to 4000µF |
| Temperature | — | -4°F to 1400°F (-20°C to 760°C), Type K |
| Cat safety rating | CAT III 600V / CAT IV 300V | CAT III 600V |
| Display count | — | 6000 |
Sources — Fluke 323 True-RMS Clamp Meter: fluke.com (verified 2026-08-05). Extech MA640 True RMS AC/DC Clamp Meter with NCV: flir.com (verified 2026-08-05).
What's the difference between the Fluke 323 True-RMS Clamp Meter and Extech MA640 True RMS AC/DC Clamp Meter with NCV?
Where the two actually differ on the specs we track (5 of 10). Matching specs are omitted.
- Ac current range: Fluke 323 True-RMS Clamp Meter 400.0 A, 2.0% ±5 digits (45-65 Hz) / 2.5% ±5 digits (65-400 Hz) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 60.00 A / 600.0 A
- Jaw opening: Fluke 323 True-RMS Clamp Meter 30 mm (600 MCM) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 1.5 in (40 mm), conductors up to 500 MCM
- Ac dc voltage range: Fluke 323 True-RMS Clamp Meter 600.0 V AC (1.5% accuracy) / 600.0 V DC (1.0% accuracy) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV AC 6.000V/60.00V/600.0V; DC 600.0mV/6.000V/60.00V/600.0V
- Resistance continuity: Fluke 323 True-RMS Clamp Meter 400.0/4000 Ω, 1.0% accuracy; continuity beeper ≤70 Ω vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 600.0Ω to 60.00MΩ, with continuity
- Cat safety rating: Fluke 323 True-RMS Clamp Meter CAT III 600V / CAT IV 300V vs Extech MA640 True RMS AC/DC Clamp Meter with NCV CAT III 600V