Extech EX655
#2 in AC/DCFull review
A well-equipped AC/DC clamp with a three-year warranty, for HVAC and maintenance technicians.
Amazon $173.50$173.50
600 A600 ACAT III 600 V / CAT II 1,000 V
3.7/5
The CL390’s AC/DC measurements with an extra bottom display, for electricians who often read a meter at an awkward angle.
- 400 AAC current
- 400 ADC current
- CAT III 600 VSafety
- 41 mmJaw
Check price at Amazon$101.66
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Second display on the bottom edge reads easily when the meter hangs or lies flat
- Reads AC and DC current with non-contact voltage and temperature
- True RMS
Cons
- Rated CAT III 600 V, not CAT IV
- Costs more than the CL390 for the same measurements
How it scores
The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | CL490 |
|---|---|
| Measurement | |
| AC current (jaw) | 400 A |
| DC current (jaw) | 400 A |
| DC microamps (leads) | 200 uA |
| Voltage | 600 V |
| Current accuracy | 2% of reading |
| Jaw opening | 41 mm |
| Safety | |
| CAT rating | CAT III 600 V |
| Features | |
| True RMS | Yes |
| Inrush | No |
| LoZ mode | No |
| Non-contact voltage | Yes |
| Low-pass filter | No |
| Temperature | Yes |
| Phone app | No |
| Build | |
| Weight | 346 g |
| Warranty | 2 years |
Alternatives in this type
Klein Tools CL390
#3 in AC/DCFull review
An affordable true-RMS AC/DC clamp that suits DIY solar, automotive and general electrical work.
Amazon $86.27$86.27
400 A400 ACAT III 600 V
Fluke 325
#5 in AC/DCFull review
A compact true-RMS AC/DC Fluke clamp for electricians who want the name and two-year warranty, though rivals offer more for less.
Amazon $298.49$298.49
400 A400 ACAT IV 300 V / CAT III 600 V
Compare
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