Extech MA440 vs Klein Tools CL490

Last updated: November 9, 2026

The Klein Tools CL490 rates 3.7 among AC/DC clamp meters; the Extech MA440 rates 3.1 among AC only ones. The Extech MA440 costs $34.67 less ($66.99 vs $101.66).

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.

Extech MA440 vs Klein Tools CL490

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 weightKlein Tools CL490Extech MA440
Overall rating3.7/53.1/5
Current range 15%46 400 A through the jaw46 400 A through the jaw
DC current 15%100 DC current to 400 A through the jaw0 no DC current
Safety rating 20%55 CAT III 600 V55 CAT III 600 V
Features 15%50 true RMS, non-contact voltage, temperature, DC microamps35 true RMS, non-contact voltage
Accuracy 10%67 2% of reading67 2% of reading
Jaw opening 5%70 41 mm jaw33 30 mm jaw
Warranty 10%50 2-year warranty50 2-year warranty
Price 10%69 $101.6687 $66.99

Specifications

Klein Tools CL490Extech MA440
Measurement
AC current (jaw)400 A400 A
DC current (jaw)400 ANo
DC microamps (leads)200 uA-
Voltage600 V-
Current accuracy2% of reading2% of reading
Jaw opening41 mm30 mm
Safety
CAT ratingCAT III 600 VCAT III 600 V
Features
True RMSYesYes
InrushNoNo
LoZ modeNoNo
Non-contact voltageYesYes
Low-pass filterNoNo
TemperatureYesNo
Phone appNoNo
Build
Weight346 g265 g
Warranty2 years2 years

All clamp meter comparisons →