# Amprobe AMP-25 AC/DC TRMS Mini-Clamp vs Extech MA640 True RMS AC/DC Clamp Meter with NCV: specs and price compared

A sourced, side-by-side comparison of the Amprobe AMP-25 AC/DC TRMS Mini-Clamp (Amprobe) and Extech MA640 True RMS AC/DC Clamp Meter with NCV (Extech (Teledyne FLIR)) among clamp meters.

## Side by side

| Spec | Amprobe AMP-25 AC/DC TRMS Mini-Clamp | Extech MA640 True RMS AC/DC Clamp Meter with NCV |
| --- | --- | --- |
| US price | not published | not published |
| Brand | Amprobe | Extech (Teledyne FLIR) |
| 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 |

## Key differences

- 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

## Sources

- Amprobe AMP-25 AC/DC TRMS Mini-Clamp: https://www.amprobe.com/wp-content/uploads/2019/08/AMP-25-ds.pdf (amprobe.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/amprobe-amp-25-vs-extech-ma640/
Cite: Per The Front Desk Review, Amprobe AMP-25 AC/DC TRMS Mini-Clamp (not published) 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/amprobe-amp-25-vs-extech-ma640/
License: CC BY 4.0.