• Extech MA140 True RMS 300A AC Clamp Meter

Compact AC Clamp Meter with NCV Detector

The MA140 is a Compact AC Clamp Meter with NCV Detector. This Clamp meter takes True RMS measurements for accurate readings of noisy, distorted or non-sinusoidal waveforms. The MA140 can measure up to 300A AC. Complete with carrying case and two LR44 batteries. UL listed with a CAT III 600V safety rating.


True RMS 300A AC Clamp Meter Features:

  • True RMS for accurate readings of noisy, distorted or non-sinusoidal waveforms
  • Compact 0.8" (22mm) jaw size accommodates conductors up to 300MCM and allows measurements in tight locations
  • Unique Smart Auto Sense feature
  • Low Pass Filter (LPF) for accurate measurement of variable frequency drive signals
  • Built-in Non-Contact Voltage (NCV) detector for quick detection of live voltage
  • Inrush current measurement
  • 6000 count backlit LCD display
  • Smart Data Hold: Audiovisual alert when a new reading exceeds 50 digits of a held reading
  • Low battery indicator and Auto Power Off feature
  • Complete with carrying case and two LR44 batteries



Specifications                                      Range
AC Current (max resolution)            60A, 300A (0.01A)
DC Current (max resolution)           
Basic accuracy                                   ±2.0%
Non-Contact Voltage (NCV)            80 to 600V
Dimensions                                         5.8x2.4x1.2" (147x60x31mm)
Weight                                                 4.9oz (140g)

Download Brochure
Download User Manual

Extech MA140 True RMS 300A AC Clamp Meter


Tags: Extech MA140 True RMS 300A AC Clamp Meter