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Klein Tools
Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ)
$152.54
Best Clamp Meters · head-to-head
Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) vs Extech MA640 True RMS AC/DC Clamp Meter with NCV
A sourced, side-by-side comparison. Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) is cheaper at $152.54. 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 | 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 | — |
| Brand | Klein Tools | Extech (Teledyne FLIR) |
| Released | — | — |
| 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 |
Sources — Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ): digikey.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 Klein Tools CL800 Digital Clamp Meter, AC Auto-Range TRMS, Low Impedance (LoZ) and Extech MA640 True RMS AC/DC Clamp Meter with NCV?
Where the two actually differ on the specs we track (8 of 10). Matching specs are omitted.
- 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