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
The Southwire 21550T rates 3.4 among AC/DC clamp meters; the Southwire 21510N rates 2.8 among AC only ones. The Southwire 21510N costs $24.76 less ($65.81 vs $90.57).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Southwire 21510N
#8 in AC onlyFull review
A basic AC clamp for household circuits, with the fewest published specs in this list.
Amazon $65.81$65.81
Scores side by side
These two sit in different type classes (AC/DC and AC only), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Southwire 21550T | Southwire 21510N |
|---|---|---|
| Overall rating | 3.4/5 | 2.8/5 |
| Current range 15% | 46 400 A through the jaw | 46 400 A through the jaw |
| DC current 15% | 100 DC current to 400 A through the jaw | 0 no DC current |
| Safety rating 20% | 55 CAT III 600 V | 55 CAT III 600 V |
| Features 15% | 45 true RMS, non-contact voltage, temperature | 10 non-contact voltage |
| Accuracy 10% | 50 current accuracy not published (neutral score used) | 50 current accuracy not published (neutral score used) |
| Jaw opening 5% | 50 jaw opening not published (neutral score used) | 50 jaw opening not published (neutral score used) |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
| Price 10% | 74 $90.57 | 88 $65.81 |
Specifications
| Southwire 21550T | Southwire 21510N | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | 400 A | No |
| Safety | ||
| CAT rating | CAT III 600 V | CAT III 600 V |
| Features | ||
| True RMS | Yes | - |
| Non-contact voltage | Yes | Yes |
| Temperature | Yes | - |