We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Slim orange digital multimeter with reverse-contrast LCD display and test leads

Klein Tools

Klein Tools MM450 Slim Digital Multimeter 2 in 1 accessory

SKU CH-MCJ5-JRJK7

Slim auto-ranging TRMS multimeter measures 600 V AC/DC, 10 A current, 50 M resistance plus temperature, capacitance, frequency and continuity with lead-alert LEDs and reverse-contrast display.

  • Measures up to 600 V AC/DC voltage for versatile electrical testing
  • Auto-ranging TRMS technology delivers accurate readings across multiple functions
  • Lead-Alert LEDs show correct test-lead placement for safer operation
  • Reverse-contrast LCD with auto backlight stays readable in any light
  • Slim profile fits in a pocket and survives a 6.6-foot drop

What the MM450 measures

The Klein Tools MM450 is a slim digital multimeter that measures AC/DC voltage up to 600V, AC/DC current up to 10A, and resistance up to 50M. It also covers temperature, capacitance, frequency, duty cycle, diode test and continuity, making it suited for electricians, HVAC technicians and maintenance staff who need one tool for multiple electrical checks.

Measurement limits and safety ratings

The meter is rated for CAT III 1000V and CAT IV 600V environments, so it can be used on distribution panels, fixed wiring and service entrances within those categories. Auto-ranging TRMS technology handles distorted waveforms, but the 600V and 10A maximums mean it cannot measure higher-voltage three-phase supplies or large industrial currents without external accessories.

What to verify before ordering

Confirm that the circuits you test fall within the 600V AC/DC and 10A AC/DC ranges and that CAT III/IV ratings satisfy your site safety requirements. The included test leads carry the same category ratings, and the thermocouple handles temperature tasks; ensure the AAA batteries supplied are acceptable for your operating temperature range. The 6.6-foot drop rating suits typical field use but does not replace insulated tools for live work.

Highlights

  • Measures up to 600 V AC/DC voltage for versatile electrical testing
  • Auto-ranging TRMS technology delivers accurate readings across multiple functions
  • Lead-Alert LEDs show correct test-lead placement for safer operation
  • Reverse-contrast LCD with auto backlight stays readable in any light
  • Slim profile fits in a pocket and survives a 6.6-foot drop

Specifications

No published specifications for this item yet.

Questions about this item

Should I choose the MM450 over other Klein multimeters for pocket-sized TRMS work?

The MM450 is the slim, pocket-friendly model that delivers auto-ranging TRMS accuracy, a reverse-contrast display with auto backlight, and lead-alert LEDs in a body rated for a 6.6-foot drop.

What does the 600 V rating mean when I am testing live circuits?

You can safely measure up to 600 V AC or DC on the meter itself; the supplied test leads are rated CAT III 1000 V and CAT IV 600 V for the same voltage levels.

How does the lead-alert feature work with the CAT III/CAT IV test leads?

LEDs on the meter light up to confirm the leads are plugged into the correct jacks for the selected function, matching the safety caps on the included leads.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.