CLAMP-GUN™ M12™ Cordless Clamp Meter-Bare Tool (NIST)

The CLAMP-GUN™ M12™ Cordless Clamp Meter (NIST) is a heavy duty True-RMS current tester for professional commercial and industrial applications. Powered by the Milwaukee M12™ REDLITHIUM™ battery, the 2239-20 features an ergonomic pistol grip design which greatly increases comfort and ease-of -use in overhead applications. The unit also provides a wide 1.57” jaw opening to easily handle wire bundles, a thin jaw profile for access to tight spaces, a large white on black display, embedded non-contact voltage detection and embedded extra bright LED Floodlight. A NIST Certificate of Calibration with Data is also included, needed by many organizations as proof of calibration with the date when NIST Calibration was performed. The 2239-20 model is a bare tool sold without a battery or charger and is covered by the Milwaukee 5-Year Warranty.


(1) CLAMP-GUN™ M12™ Cordless Clamp Meter-Bare Tool (NIST) (2239-20NST) (1) Manual (1) Test Lead Set (1) NIST Certificate of Calibration with Data
  • Ergonomic Pistol Grip Design Best Orients Jaws and Display
  • Extra Large Jaw Size of 1.57” measuring up to 1000 MCM cable
  • Wide Current Range to 1000 amps AC/DC
  • In-rush current measurement for motor starts
  • Wide Voltage Range to 1000 volts AC/DC
  • CAT IV 600V / CAT III 1000V for greater safety
  • High Contrast, White on Black Display with Backlight for easy reading
  • LED Floodlight and Voltage Detection Add More Value
  • Frequency measurement from 6 Hz to 6 kHz
Download Owner's Manual Download Service Parts List

Product Specifications

Tool Warranty 5 Years
Switch Type Dial
Jaw Size 1.57"
Safety Rating CAT IV 600V / CAT III 1000V
Voltage AC DC 1000V
Frequency Yes
Continuity Yes
Capacitance 0.1uF-4000uF
Hold Yes
Display Backlight Yes
LED Work Light Yes
Rugged Over molding Yes
Indication Visual (for NCVD)
Battery Type M12™ REDLITHIUM™ Rechargeable
Display Type High Contrast White on Black