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 rates 3.7 among AC/DC clamp meters; the Klein Tools CL220 rates 3.2 among AC only ones. The Klein Tools CL220 costs $16.30 less ($69.97 vs $86.27).
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.
Klein Tools CL220
#3 in AC onlyFull review
A low-cost true-RMS AC clamp for home and light electrical work, with temperature for basic HVAC checks.
Amazon $69.97$69.97
Scores side by side
These two sit in different type classes (AC/DC and AC only), and each is scored against the reference points for its own class, so a rating says how well each does among its own type peers. How we rank explains each factor.
| Factor weight | Klein Tools CL390 | Klein Tools CL220 |
|---|---|---|
| Overall rating | 3.7/5 | 3.2/5 |
| 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 | 0 no DC current |
| Safety rating 20% | 55 CAT III 600 V | 55 CAT III 600 V |
| Features 15% | 50 true RMS, non-contact voltage, temperature, DC microamps | 45 true RMS, non-contact voltage, temperature |
| Accuracy 10% | 67 2% of reading | 67 2% of reading |
| Jaw opening 5% | 70 41 mm jaw | 70 41 mm jaw |
| Warranty 10% | 50 2-year warranty | 50 2-year warranty |
| Price 10% | 76 $86.27 | 85 $69.97 |
Specifications
| Klein Tools CL390 | Klein Tools CL220 | |
|---|---|---|
| Measurement | ||
| AC current (jaw) | 400 A | 400 A |
| DC current (jaw) | 400 A | No |
| DC microamps (leads) | 200 uA | - |
| Voltage | 600 V | 600 V |
| Current accuracy | 2% of reading | 2% of reading |
| Jaw opening | 41 mm | 41 mm |
| Safety | ||
| CAT rating | CAT III 600 V | CAT III 600 V |
| Features | ||
| True RMS | Yes | Yes |
| Inrush | No | No |
| LoZ mode | No | No |
| Non-contact voltage | Yes | Yes |
| Low-pass filter | No | No |
| Temperature | Yes | Yes |
| Phone app | No | No |
| Build | ||
| Weight | 291 g | 313 g |
| Warranty | 2 years | 2 years |