Klein Tools CL390
#3 in AC/DCFull review
An affordable true-RMS AC/DC clamp that suits DIY solar, automotive and general electrical work.
Amazon $86.27$86.27
The Klein Tools CL390 is the better clamp meter overall, rated 3.7 to 3.5. The Klein Tools CL390 leads on price, features and jaw opening. The Fluke 325 wins on safety rating. The Klein Tools CL390 costs $212.22 less ($86.27 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.
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
Which should you buy?
- Choose the Klein Tools CL390 for price ($86.27 vs $298.49), features (true RMS, non-contact voltage, temperature, DC microamps vs true RMS, temperature) and jaw opening (41 mm jaw vs 30 mm jaw).
- Choose the Fluke 325 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/DC clamp meter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Klein Tools CL390 | Fluke 325 |
|---|---|---|
| Overall rating | 3.7/5 | 3.5/5 |
| 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% | 55 CAT III 600 V | 75 CAT IV 300 V / CAT III 600 V |
| Features 15% | 50 true RMS, non-contact voltage, temperature, DC microamps | 35 true RMS, temperature |
| Accuracy 10% | 67 2% of reading | 67 2% of reading |
| Jaw opening 5% | 70 41 mm jaw | 33 30 mm jaw |
| Warranty 10% | 50 2-year warranty | 50 2-year warranty |
| Price 10% | 76 $86.27 | 22 $298.49 |
Specifications
| Klein Tools CL390 | Fluke 325 | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | 400 A | 400 A |
| DC microamps (leads) | 200 uA | - |
| Voltage | 600 V | 600 V |
| Current accuracy | 2% of reading | 2% of reading |
| Jaw opening | 41 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 | Yes | Yes |
| Phone app | No | No |
| Build | ||
| Weight | 291 g | 283 g |
| Warranty | 2 years | 2 years |