Fluke 323
#5 in AC onlyFull review
A simple, well-built true-RMS AC clamp for electricians who want a Fluke for everyday panel and circuit checks.
Amazon $152.85$152.85
The Fluke 323 is the better clamp meter overall, rated 3.0 to 2.8. The Fluke 323 leads on safety rating and features. The Southwire 21510N wins on price. The Southwire 21510N costs $87.04 less ($65.81 vs $152.85).
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 Fluke 323 for safety rating (CAT IV 300 V / CAT III 600 V vs CAT III 600 V) and features (true RMS vs non-contact voltage).
- Choose the Southwire 21510N for price ($65.81 vs $152.85).
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 | Fluke 323 | Southwire 21510N |
|---|---|---|
| Overall rating | 3.0/5 | 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% | 75 CAT IV 300 V / CAT III 600 V | 55 CAT III 600 V |
| Features 15% | 25 true RMS | 10 non-contact voltage |
| Accuracy 10% | 67 2% of reading | 50 current accuracy not published (neutral score used) |
| Jaw opening 5% | 33 30 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% | 51 $152.85 | 88 $65.81 |
Specifications
| Fluke 323 | 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 | 30 mm | - |
| Safety | ||
| CAT rating | CAT IV 300 V / CAT III 600 V | CAT III 600 V |
| Features | ||
| True RMS | Yes | - |
| Inrush | No | - |
| LoZ mode | No | - |
| Non-contact voltage | No | Yes |
| Low-pass filter | No | - |
| Temperature | No | - |
| Phone app | No | - |
| Build | ||
| Weight | 265 g | - |
| Warranty | 2 years | - |