# Fluke 323 True-RMS Clamp Meter vs Extech MA640 True RMS AC/DC Clamp Meter with NCV: specs and price compared

A sourced, side-by-side comparison of the Fluke 323 True-RMS Clamp Meter (Fluke) and Extech MA640 True RMS AC/DC Clamp Meter with NCV (Extech (Teledyne FLIR)) among clamp meters.

## Side by side

| Spec | Fluke 323 True-RMS Clamp Meter | Extech MA640 True RMS AC/DC Clamp Meter with NCV |
| --- | --- | --- |
| US price | $207.99 | not published |
| Brand | Fluke | Extech (Teledyne FLIR) |
| 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 |

## Key differences

- 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

## Sources

- Fluke 323 True-RMS Clamp Meter: https://www.fluke.com/en-us/product/electrical-testing/clamp-meters/fluke-323 (fluke.com, verified 2026-08-05)
- Extech MA640 True RMS AC/DC Clamp Meter with NCV: https://www.flir.com/products/ma640?vertical=condition+monitoring&segment=solutions (flir.com, verified 2026-08-05)

Canonical: https://frontdeskreview.com/gear/clamp-meters/fluke-323-vs-extech-ma640/
Cite: Per The Front Desk Review, Fluke 323 True-RMS Clamp Meter ($207.99) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/clamp-meters/fluke-323-vs-extech-ma640/
License: CC BY 4.0.