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
400 A400 ACAT III 600 V
3.5/5
A compact true-RMS AC/DC Fluke clamp for electricians who want the name and two-year warranty, though rivals offer more for less.
- 400 AAC current
- 400 ADC current
- CAT IV 300 V / CAT III 600 VSafety
- 30 mmJaw
Check price at Amazon$298.49
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Reads DC current as well as AC, for solar, battery and vehicle work
- Rated CAT IV 300 V for work at the service entrance
- Temperature, capacitance and frequency in one meter
Cons
- No inrush mode or non-contact voltage detector
- Costs far more than AC/DC clamps with a longer feature list
The Fluke 320 Series family
Every Fluke 320 Series model we rank, smallest first. Ratings compare each against its own type.
| Model | AC current | Rating | Price |
|---|---|---|---|
| Fluke 323 | 400 A | 3.0/5 | $152.85 |
| Fluke 325 (this one) | 400 A | 3.5/5 | $298.49 |
How it scores
The rating comes from 8 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | FLUKE-325 |
|---|---|
| Measurement | |
| AC current (jaw) | 400 A |
| DC current (jaw) | 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 |
| Features | |
| True RMS | Yes |
| Inrush | No |
| LoZ mode | No |
| Non-contact voltage | No |
| Low-pass filter | No |
| Temperature | Yes |
| Phone app | No |
| Build | |
| Weight | 283 g |
| Warranty | 2 years |
Alternatives in this type
Klein Tools CL490
#4 in AC/DCFull review
The CL390’s AC/DC measurements with an extra bottom display, for electricians who often read a meter at an awkward angle.
Amazon $101.66$101.66
400 A400 ACAT III 600 V
Amprobe AMP-220
#6 in AC/DCFull review
An accurate AC/DC clamp for motor and drive maintenance, priced above rivals with similar features.
Amazon $243.99$243.99
600 A600 ACAT III 600 V
Compare
Compare the Fluke 325 with any other clamp meter →
More from Fluke: every Fluke product ranked.