Front view of the Klein Tools MM325 digital multimeter against a white background. The orange and black device features a large digital LCD screen at the top showing a test pattern. Below the screen are grey buttons for data hold and a backlight, a large central rotary selector dial for various testing functions, and three input terminals at the bottom for test leads.
Angled three-quarter view of the MM325 multimeter standing upright on its integrated black kickstand. The device is shown from the left side, highlighting the rugged orange protective overmold and the clear markings on the central function selector dial.
Front-facing studio shot of the MM325 multimeter with the display off, showing the orange housing and black interface. The dial is set to the OFF position, and the CAT III 600V safety rating is visible at the bottom right.
Rear view of the MM325 multimeter showing the back of the orange and black housing. One red test lead is clipped into a dedicated storage slot on the right side, and a grey safety cap for a test lead probe lies on the white surface below.
A set of red and black test leads for the multimeter, coiled together against a white background. The set includes two pointed probes with red and black handles and two right-angle connectors, with one grey safety cap shown separately.
Product infographic featuring the MM325 multimeter with text and icons highlighting its technical capabilities. The graphic specifies manual ranging and lists measurements for 600V AC/DC voltage, 10A DC current, 2M Ohm resistance, 2-meter drop protection, and a CAT III 600V safety rating.
Annotated product graphic showing an angled view of the MM325 multimeter with yellow lines pointing to key features. Labeled features include Auto Power-Off, Backlight, Audible Continuity, Function Selector Switch, Lead Alert Protection, Battery Test, and Data Hold.
Rear view infographic of the MM325 highlighting back-of-tool features with yellow lines. Labels indicate a mount for an optional magnetic hanger, integrated test lead storage and holder, and the fold-out kickstand.
Close-up graphic focusing on the bottom input terminals of the MM325 multimeter titled LEAD ALERT PROTECTION. Two green LEDs are shown illuminating around the 10A and COM terminals to indicate proper lead placement for safe operation.
Action shot of a person using the MM325 multimeter to test a wall outlet. The multimeter is propped up on its kickstand on a grey countertop, showing a reading of 121.5V on its backlit blue display as the user inserts the red and black probes into an electrical socket.
A person's hands are shown using the red and black probes of the Klein Tools MM325 digital multimeter to test a small 9V battery on a wooden surface. The multimeter's backlit blue screen displays a reading of 9.04.
A worker uses the red and black probes of the MM325 multimeter to test a circuit inside an open grey electrical box mounted on a brick wall. The multimeter is propped up on its kickstand on top of the box, showing a reading of 239.5 on its backlit blue display.
A close-up view of a worker's hands holding the back of the orange Klein Tools MM325 multimeter, demonstrating the installation or use of an optional black magnetic hanger accessory. The background shows blurred electrical wiring and components within a panel.
Klein Tools Digital Multimeters (MM325, MM420, MM450, MM720) promotional video
Front view of the Klein Tools MM325 digital multimeter against a white background. The orange and black device features a large digital LCD screen at the top showing a test pattern. Below the screen are grey buttons for data hold and a backlight, a large central rotary selector dial for various testing functions, and three input terminals at the bottom for test leads.
Angled three-quarter view of the MM325 multimeter standing upright on its integrated black kickstand. The device is shown from the left side, highlighting the rugged orange protective overmold and the clear markings on the central function selector dial.
Front-facing studio shot of the MM325 multimeter with the display off, showing the orange housing and black interface. The dial is set to the OFF position, and the CAT III 600V safety rating is visible at the bottom right.
Rear view of the MM325 multimeter showing the back of the orange and black housing. One red test lead is clipped into a dedicated storage slot on the right side, and a grey safety cap for a test lead probe lies on the white surface below.
A set of red and black test leads for the multimeter, coiled together against a white background. The set includes two pointed probes with red and black handles and two right-angle connectors, with one grey safety cap shown separately.
Product infographic featuring the MM325 multimeter with text and icons highlighting its technical capabilities. The graphic specifies manual ranging and lists measurements for 600V AC/DC voltage, 10A DC current, 2M Ohm resistance, 2-meter drop protection, and a CAT III 600V safety rating.
Annotated product graphic showing an angled view of the MM325 multimeter with yellow lines pointing to key features. Labeled features include Auto Power-Off, Backlight, Audible Continuity, Function Selector Switch, Lead Alert Protection, Battery Test, and Data Hold.
Rear view infographic of the MM325 highlighting back-of-tool features with yellow lines. Labels indicate a mount for an optional magnetic hanger, integrated test lead storage and holder, and the fold-out kickstand.
Close-up graphic focusing on the bottom input terminals of the MM325 multimeter titled LEAD ALERT PROTECTION. Two green LEDs are shown illuminating around the 10A and COM terminals to indicate proper lead placement for safe operation.
Action shot of a person using the MM325 multimeter to test a wall outlet. The multimeter is propped up on its kickstand on a grey countertop, showing a reading of 121.5V on its backlit blue display as the user inserts the red and black probes into an electrical socket.
A person's hands are shown using the red and black probes of the Klein Tools MM325 digital multimeter to test a small 9V battery on a wooden surface. The multimeter's backlit blue screen displays a reading of 9.04.
A worker uses the red and black probes of the MM325 multimeter to test a circuit inside an open grey electrical box mounted on a brick wall. The multimeter is propped up on its kickstand on top of the box, showing a reading of 239.5 on its backlit blue display.
A close-up view of a worker's hands holding the back of the orange Klein Tools MM325 multimeter, demonstrating the installation or use of an optional black magnetic hanger accessory. The background shows blurred electrical wiring and components within a panel.
Klein Tools Digital Multimeters (MM325, MM420, MM450, MM720) promotional video
KLEIN TOOLS

Klein Tools MM325 Digital Multimeter Manual Ranging 600V AC DC Voltage Tester Backlit Display 10A Current Resistance Diode Battery Test Functions

In stock
SKU: MM325
$34.97 USD

Description

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Professional Grade Electrical Testing: Accurate, Rugged, and Reliable

The Klein Tools MM325 Digital Multimeter is a manual-ranging powerhouse designed from the ground up by electricians, for electricians. This versatile diagnostic tool is essential for residential, business, and light-industrial applications, offering precise measurements for AC/DC voltage up to 600V and DC current up to 10A. Whether you are troubleshooting household outlets, testing automotive batteries, or verifying resistance in electrical components, the MM325 provides the accuracy and safety required by professionals. Its innovative Lead Alert protection uses integrated LEDs to guide correct test lead placement, significantly reducing the risk of errors during critical measurements.

Engineered to survive the toughest jobsites, this multimeter features a ruggedized housing built to withstand a 6.6-foot drop. The easy-to-read backlit display ensures you can capture data in low-light environments, such as crawlspaces or electrical closets, while the data hold function allows you to lock measurements on the screen. With a CAT III 600V safety rating and a dedicated battery testing function, the MM325 is a time-saving asset for any tool bag. Its accessible battery and fuse compartment means you spend less time on maintenance and more time getting the job done safely and efficiently.

Key Features

  • Comprehensive Measurement: Measures up to 600V AC/DC voltage, 10A DC current, and 2 MOhms resistance.
  • Safety Lead Alert: Visual LED protection ensures test leads are placed in the correct terminals for the selected task.
  • Enhanced Visibility: High-visibility backlit display for working in dark or poorly lit environments.
  • Versatile Testing: Includes dedicated functions for testing batteries, diodes, and audible continuity.
  • Jobsite Durability: Rugged construction designed to withstand a 6.6-foot (2 m) drop.
  • Power Management: Features auto power-off and a low battery indicator to ensure the tool is ready when you are.
  • Safety Rated: CAT III 600V safety rating for use in residential and light-industrial locations.

What's Included

  • (1) MM325 Manual-Ranging Digital Multimeter
  • (1) Set of Test Leads with CAT III/CAT IV Safety Caps
  • (2) AAA Batteries
  • (1) User Manual

 

Specifications

Specification Details
Display Type 2000 Count Backlit LCD
Voltage Rating 600V AC/DC
Current Rating 10A DC
Resistance Range 2MΩ
Safety Rating CAT III 600V
Drop Protection 6.6 Feet
Overall Length 6.41 Inches
Overall Width 3.13 Inches
Overall Height 1.83 Inches
Weight 8.8 oz.
Material ABS and Electrical Components
Special Functions Lead Alert, Data Hold, Auto Power-Off

Pro-Tip: Always perform a "live-dead-live" test before starting work. Test the MM325 on a known live source, verify your target circuit is de-energized, and then re-test on the known live source to confirm your meter is functioning correctly. This ensures the 0V reading isn't due to a blown fuse or dead battery.