Southwire 21550T
#8 in AC/DCFull review
A true-RMS AC/DC clamp with handy jobsite touches, for electricians who don’t need inrush or a CAT IV rating.
Amazon $90.57$90.57
400 A400 ACAT III 600 V
3.2/5
A slim, light AC/DC clamp for residential and light commercial work where tight panels matter more than a high safety rating.
- 600 AAC current
- 600 ADC current
- CAT III 300 VSafety
- 34 mmJaw
Check price at Amazon$127.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Slim 10 mm jaw arm slips between crowded wires in a panel
- Reads AC and DC current to 600 A
- Light at 154 g
Cons
- Rated only CAT III 300 V, too low for 480 V panels and service work
- Not true RMS, so readings drift on electronic loads
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 | FLUKE-301D/ESP (6016352) |
|---|---|
| Measurement | |
| AC current (jaw) | 600 A |
| DC current (jaw) | 600 A |
| Voltage | 600 V |
| Current accuracy | 2% of reading |
| Jaw opening | 34 mm |
| Safety | |
| CAT rating | CAT III 300 V |
| Features | |
| True RMS | No |
| Inrush | No |
| LoZ mode | No |
| Non-contact voltage | No |
| Low-pass filter | No |
| Temperature | No |
| Phone app | No |
| Build | |
| Weight | 154 g |
| Warranty | 2 years |
Alternatives in this type
UNI-T UT204R
#9 in AC/DCFull review
A low-cost AC/DC clamp for car, solar and household work where a high safety rating isn’t needed.
Amazon $76.49$76.49
600 A600 ACAT III 300 V / CAT II 600 V
UNI-T UT210E
#11 in AC/DCFull review
A pocket AC/DC clamp for automotive, electronics and small-appliance work where low-current resolution matters more than range.
Amazon $59.39$59.39
100 A100 ACAT III 300 V / CAT II 600 V
Compare
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