Extech Compact AC/DC Clamp Meter

Extech Compact AC/DC Clamp Meter


The Extech Compact AC/DC Clamp Meter features smart auto sense that enables the meter to recognize the input and automatically switch to the correct mode of operation.


  • Built-In Non-Contact Voltage Detector
  • Inrush Current Measurement
  • 6000 Count Backlit LCD Display
Your Price
Drop ships from manufacturer

Shipping Information
Return Policy
Why Buy From Fondriest?


Choice of AC Current or AC/DC Current model with 0.8" (22mm) jaw size and high accuracy. Smart Auto Sense feature enables the MA145 to recognize the input (within a given function) and automatically switch to the correct mode of operation (i.e. AC to DC Current measurement). Built-in Non-Contact Voltage (NCV) Detector allows for quick detection of live voltage.



  • AC/DC Current and Zero function for accurate DC measurements
  • 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
  • Smart Data Hold: Audiovisual alert when a new reading exceeds 50 digits of a held reading
  • Low battery indicator and Auto Power Off feature
  • CAT III-600V safety rating
Notable Specifications:
  • AC Current (max resolution): 60A, 300A (0.01A)
  • DC Current (max resolution): 60A, 300A (0.01A)
  • Basic accuracy: AC: ±1.5%, DC: ±1.5%
  • Non-Contact Voltage (NCV): 80 to 600V
  • Dimensions: 5.8x2.4x1.2" (147x60x31mm)
What's Included:

(1) Meter

(1) Carrying Case

(2) LR44 Batteries

Image Part # Product Description Price Stock Order
Extech Compact AC/DC Clamp Meter MA145 Compact AC/DC Clamp Meter
Drop ships from manufacturer

In The News

US Steel Dumping Chromium: Citizens Fighting for Lake Michigan, and Drinkable Water

If you remember the movie “Erin Brockovich,†you are already familiar with hexavalent chromium, a toxic substance that was contaminating the drinking water of people in California in the movie ( and in real life ). Although on the silver screen there was a very satisfying Hollywood resolution to the problem, there has not yet been such a happy ending in real life. The dumping of the hexavalent chromium by PG&E that the film documented took place in the 1950s and 1960s, although the company didn't tell anyone about the problem until the late 1980s. Based on current litigation around the Illinois and Indiana shores of Lake Michigan, startlingly little has changed.

Read More

Monitoring the Mississippi: Wild Celery, Redhorse and More

The Upper Mississippi stretches from headwaters at Lake Itasca, Minnesota, all the way to Cairo, Illinois, about 1,250 miles. It includes picturesque wilderness areas complete with waterfalls, limestone bluffs and expansive valleys. It has attracted many campers, hikers, fishing enthusiasts and people seeking to launch their favorite boats or canoes. It has also been a haven for environmental researchers. Since 2016, Jeff Houser is the Science Director for the Long Term Resource Monitoring element (LTRM) of the Upper Mississippi River Restoration Program (UMRR).  Previously, he led the LTRM water quality component from 2003 until 2016.

Read More

BOB and MARI Will Monitor Water Chemistry in the San Francisco Bay

Scientists have had nagging questions about how ocean acidification might be affecting the waters of the San Francisco Bay. But if you can't trust BOB and MARI with your research questions, who can you trust? That's BOB, the Bay Ocean Buoy and MARI, BOB's companion mooring for Marine Acidification Research Inquiry, of course. BOB and MARI are a bright yellow, five-foot tall buoy and its companion mooring, respectively. They are anchored near the Estuary and Ocean Science (EOS) Center of San Francisco State University (SFSU). SFSU researchers are collaborating with scientists from the University of California, Davis and other funders and partner organizations on the first long-term project to monitor carbon dioxide and ocean acidity in the San Francisco Bay.

Read More