# Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV: specs and price compared

A sourced, side-by-side comparison of the Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) (Klein Tools) and Extech MA640 True RMS AC/DC Clamp Meter with NCV (Extech (Teledyne FLIR)) among clamp meters.

## Side by side

| Spec | Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) | Extech MA640 True RMS AC/DC Clamp Meter with NCV |
| --- | --- | --- |
| US price | $152.54 | not published |
| Brand | Klein Tools | Extech (Teledyne FLIR) |
| Ac current range | 600 A | 60.00 A / 600.0 A |
| Dc current range | 600 A | 60.00 A / 600.0 A |
| Jaw opening | 1.38 in (3.5 cm) | 1.5 in (40 mm), conductors up to 500 MCM |
| Ac dc voltage range | 1000 V AC/DC | AC 6.000V/60.00V/600.0V; DC 600.0mV/6.000V/60.00V/600.0V |
| True rms | Yes | Yes |
| Resistance continuity | 60 MΩ max, with continuity | 600.0Ω to 60.00MΩ, with continuity |
| Capacitance | 6000 µF | 40.00nF to 4000µF |
| Temperature | -14°F to 1000°F (-26°C to 538°C), via included thermocouple | -4°F to 1400°F (-20°C to 760°C), Type K |
| Cat safety rating | CAT IV 600V / CAT III 1000V | CAT III 600V |
| Display count | 6000 | 6000 |

## Key differences

- Ac current range: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 600 A vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 60.00 A / 600.0 A
- Dc current range: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 600 A vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 60.00 A / 600.0 A
- Jaw opening: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 1.38 in (3.5 cm) 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: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 1000 V AC/DC 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: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 60 MΩ max, with continuity vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 600.0Ω to 60.00MΩ, with continuity
- Capacitance: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) 6000 µF vs Extech MA640 True RMS AC/DC Clamp Meter with NCV 40.00nF to 4000µF
- Temperature: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) -14°F to 1000°F (-26°C to 538°C), via included thermocouple vs Extech MA640 True RMS AC/DC Clamp Meter with NCV -4°F to 1400°F (-20°C to 760°C), Type K
- Cat safety rating: Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) CAT IV 600V / CAT III 1000V vs Extech MA640 True RMS AC/DC Clamp Meter with NCV CAT III 600V

## Sources

- Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ): https://www.digikey.com/en/products/detail/klein-tools-inc/CL800/6597092 (digikey.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/klein-tools-cl800-vs-extech-ma640/
Cite: Per The Front Desk Review, Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) ($152.54) 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/klein-tools-cl800-vs-extech-ma640/
License: CC BY 4.0.