Extech MA440
#4 in AC onlyFull review
A plain true-RMS AC clamp for electricians and technicians who only need current, voltage and resistance.
Amazon $66.99$66.99
The Extech MA440 and the Fluke 323 are evenly matched, rated 3.1 and 3.0. The Extech MA440 leads on price and features. The Fluke 323 wins on safety rating. The Extech MA440 costs $85.86 less ($66.99 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.
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
Which should you buy?
- Choose the Extech MA440 for price ($66.99 vs $152.85) and features (true RMS, non-contact voltage vs true RMS).
- Choose the Fluke 323 for safety rating (CAT IV 300 V / CAT III 600 V vs CAT III 600 V).
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 | Extech MA440 | Fluke 323 |
|---|---|---|
| Overall rating | 3.1/5 | 3.0/5 |
| 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 | 75 CAT IV 300 V / CAT III 600 V |
| Features 15% | 35 true RMS, non-contact voltage | 25 true RMS |
| Accuracy 10% | 67 2% of reading | 67 2% of reading |
| Jaw opening 5% | 33 30 mm jaw | 33 30 mm jaw |
| Warranty 10% | 50 2-year warranty | 50 2-year warranty |
| Price 10% | 87 $66.99 | 51 $152.85 |
Specifications
| Extech MA440 | Fluke 323 | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | No | No |
| Voltage | - | 600 V |
| Current accuracy | 2% of reading | 2% of reading |
| Jaw opening | 30 mm | 30 mm |
| Safety | ||
| CAT rating | CAT III 600 V | CAT IV 300 V / CAT III 600 V |
| Features | ||
| True RMS | Yes | Yes |
| Inrush | No | No |
| LoZ mode | No | No |
| Non-contact voltage | Yes | No |
| Low-pass filter | No | No |
| Temperature | No | No |
| Phone app | No | No |
| Build | ||
| Weight | 265 g | 265 g |
| Warranty | 2 years | 2 years |