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Amprobe
Amprobe AMP-25 AC/DC TRMS Mini-Clamp
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Best Clamp Meters · head-to-head
Amprobe AMP-25 AC/DC TRMS Mini-Clamp vs Extech MA640 True RMS AC/DC Clamp Meter with NCV
A sourced, side-by-side comparison. Amprobe AMP-25 AC/DC TRMS Mini-Clamp is cheaper at —. 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 | Amprobe AMP-25 AC/DC TRMS Mini-Clamp | Extech MA640 True RMS AC/DC Clamp Meter with NCV |
|---|---|---|
| US price | — | — |
| Brand | Amprobe | Extech (Teledyne FLIR) |
| Released | — | — |
| Ac current range | 60.00 / 300.0 A | 60.00 A / 600.0 A |
| Dc current range | 60.00 / 300.0 A | 60.00 A / 600.0 A |
| Jaw opening | 1.0 in (25 mm) max | 1.5 in (40 mm), conductors up to 500 MCM |
| Ac dc voltage range | — | AC 6.000V/60.00V/600.0V; DC 600.0mV/6.000V/60.00V/600.0V |
| True rms | Yes | Yes |
| Resistance continuity | — | 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 III 600V |
| Display count | 6000 | 6000 |
Sources — Amprobe AMP-25 AC/DC TRMS Mini-Clamp: amprobe.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 Amprobe AMP-25 AC/DC TRMS Mini-Clamp and Extech MA640 True RMS AC/DC Clamp Meter with NCV?
Where the two actually differ on the specs we track (3 of 10). Matching specs are omitted.
- Ac current range: Amprobe AMP-25 AC/DC TRMS Mini-Clamp 60.00 / 300.0 A vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 60.00 A / 600.0 A
- Dc current range: Amprobe AMP-25 AC/DC TRMS Mini-Clamp 60.00 / 300.0 A vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 60.00 A / 600.0 A
- Jaw opening: Amprobe AMP-25 AC/DC TRMS Mini-Clamp 1.0 in (25 mm) max vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 1.5 in (40 mm), conductors up to 500 MCM