Fluke 325
#5 in AC/DCFull review
A compact true-RMS AC/DC Fluke clamp for electricians who want the name and two-year warranty, though rivals offer more for less.
Amazon $298.49$298.49
The Fluke 325 is the better clamp meter overall, rated 3.5 to 3.4. The Fluke 325 leads on safety rating. The Southwire 21550T wins on price and features. The Southwire 21550T costs $207.92 less ($90.57 vs $298.49).
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 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
Which should you buy?
- Choose the Fluke 325 for safety rating (CAT IV 300 V / CAT III 600 V vs CAT III 600 V).
- Choose the Southwire 21550T for price ($90.57 vs $298.49) and features (true RMS, non-contact voltage, temperature vs true RMS, temperature).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every AC/DC clamp meter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Fluke 325 | Southwire 21550T |
|---|---|---|
| Overall rating | 3.5/5 | 3.4/5 |
| 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 | 100 DC current to 400 A through the jaw |
| Safety rating 20% | 75 CAT IV 300 V / CAT III 600 V | 55 CAT III 600 V |
| Features 15% | 35 true RMS, temperature | 45 true RMS, non-contact voltage, temperature |
| 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% | 22 $298.49 | 74 $90.57 |
Specifications
| Fluke 325 | Southwire 21550T | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | 400 A | 400 A |
| 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 | Yes |
| Inrush | No | - |
| LoZ mode | No | - |
| Non-contact voltage | No | Yes |
| Low-pass filter | No | - |
| Temperature | Yes | Yes |
| Phone app | No | - |
| Build | ||
| Weight | 283 g | - |
| Warranty | 2 years | - |