Klein Tools CL220
#3 in AC onlyFull review
A low-cost true-RMS AC clamp for home and light electrical work, with temperature for basic HVAC checks.
Amazon $69.97$69.97
The Klein Tools CL220 is the better clamp meter overall, rated 3.2 to 2.8. The Klein Tools CL220 leads on features. The Southwire 21510N costs $4.16 less ($65.81 vs $69.97).
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
Which should you buy?
- Choose the Klein Tools CL220 for features (true RMS, non-contact voltage, temperature vs non-contact voltage).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every AC only clamp meter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Klein Tools CL220 | Southwire 21510N |
|---|---|---|
| Overall rating | 3.2/5 | 2.8/5 |
| Current range 15% | 46 400 A through the jaw | 46 400 A through the jaw |
| DC current 15% | 0 no DC current | 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% | 67 2% of reading | 50 current accuracy not published (neutral score used) |
| Jaw opening 5% | 70 41 mm jaw | 50 jaw opening not published (neutral score used) |
| Warranty 10% | 50 2-year warranty | 0 warranty not published, scored as none |
| Price 10% | 85 $69.97 | 88 $65.81 |
Specifications
| Klein Tools CL220 | Southwire 21510N | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | No | No |
| Voltage | 600 V | - |
| Current accuracy | 2% of reading | - |
| Jaw opening | 41 mm | - |
| Safety | ||
| CAT rating | CAT III 600 V | CAT III 600 V |
| Features | ||
| True RMS | Yes | - |
| Inrush | No | - |
| LoZ mode | No | - |
| Non-contact voltage | Yes | Yes |
| Low-pass filter | No | - |
| Temperature | Yes | - |
| Phone app | No | - |
| Build | ||
| Weight | 313 g | - |
| Warranty | 2 years | - |