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
2.9/5
A pocket AC/DC clamp for automotive, electronics and small-appliance work where low-current resolution matters more than range.
- 100 AAC current
- 100 ADC current
- CAT III 300 V / CAT II 600 VSafety
- 17 mmJaw
Check price at Amazon$59.39
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Small enough for a pocket, with a 17 mm jaw that fits around single wires in tight spots
- Reads AC and DC current down to milliamps, good for car parasitic-draw and small DC loads
- True RMS with a VFC mode for variable-speed drives
Cons
- Tops out at 100 A
- Rated only CAT III 300 V, so not for panels above household branch circuits
- No published warranty
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 | UT210E |
|---|---|
| Measurement | |
| AC current (jaw) | 100 A |
| DC current (jaw) | 100 A |
| Voltage | 600 V |
| Jaw opening | 17 mm |
| Safety | |
| CAT rating | CAT III 300 V / CAT II 600 V |
| Features | |
| True RMS | Yes |
| Inrush | No |
| LoZ mode | No |
| Non-contact voltage | Yes |
| Low-pass filter | Yes |
| Temperature | No |
| Phone app | No |
| Build | |
| Weight | 170 g |
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
Fluke 301D
#10 in AC/DCFull review
A slim, light AC/DC clamp for residential and light commercial work where tight panels matter more than a high safety rating.
Amazon $127.99$127.99
600 A600 ACAT III 300 V
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