SKU: 9843812647

Klein Tools Multimeter MM420 600V Digital AC DC Auto Ranging Circuit Tester (True RMS Backlit LCD Lead Alert Temperature Capacitance Diagnostics)

Sale price$58.48 Regular price$64.98
Save 10%

Pay in installments of $16.25 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 17 - Jul 22

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Klein Tools Multimeter MM420 600V Digital AC DC Auto Ranging Circuit Tester (True RMS Backlit LCD Lead Alert Temperature Capacitance Diagnostics)Prevent Input Terminal Miswiring Disasters And Audit Commercial Service Outlets Instantly With Illuminated Lead Alert Diagnostic Guidance The Klein Tools MM420 is an automatically ranging True RMS digital multimeter engineered for evaluating branch electrical circuitry up to 600V AC DC and 10A current loops. This professional test instrument integrates an intelligent LED Lead Alert mechanism that illuminates the correct input jacks to prevent

Prevent Input Terminal Miswiring Disasters And Audit Commercial Service Outlets Instantly With Illuminated Lead Alert Diagnostic Guidance

The Klein Tools MM420 is an automatically ranging True RMS digital multimeter engineered for evaluating branch electrical circuitry up to 600V AC/DC and 10A current loops. This professional test instrument integrates an intelligent LED Lead Alert mechanism that illuminates the correct input jacks to prevent component terminal damage or blown internal safety fuses before testing sequences begin. Operating within a certified CAT III 600V safety envelope, the device provides a 4000-count backlit LCD screen, a 50MΩ resistance scale, and a thermal thermocouple port to execute complete environmental diagnostic and motor winding audits.

Best Used For:

  • Commercial Power Auditing: Inspecting main panel branches, distribution lines, and industrial electrical boxes for running voltage imbalances up to 600V.
  • HVAC Thermal Balancing: Interfacing the included temperature thermocouple to monitor structural climate control ductwork and compressor exhaust profiles.
  • Motor Winding Diagnoses: Sweeping inductive coils, industrial motor windings, and internal circuitry up to 50MΩ to capture insulation degradation trends.

Key Performance & Safety Features

  • True RMS Signal Processing: Auto-ranging TRMS diagnostic architecture filters out harmonic noise spikes to maintain measurement accuracy on non-linear loads.
  • Visual Lead Alert Matrix: Onboard terminal indicator LEDs glow dynamically to verify correct diagnostic lead configuration before running active line sweeps.
  • Multi-Parameter Inspection Grid: Measures continuous current parameters up to 10A, capacitance runs to 400µF, and high-frequency structural lines.
  • High-Visibility Backlit Screen: Clear 4000-count digital display interface populates illuminated character fields to conquer visibility barriers inside tight mechanical vaults.
  • Industrial Concrete Survival: Ruggedized impact-resistant casing geometry passes structural drop validation testing on raw jobsite floors from up to 6.6 feet.

What's Included

  • MM420 Digital Multimeter
  • Set of Test Leads with CAT III/CAT IV Safety Caps
  • Thermocouple with Adapter
  • Two AAA Alkaline Batteries
  • Owner's Manual

Technical Specifications

Voltage Measurement Bounds: 600V AC / 600V DC
Current Scale Range: 10A AC / 10A DC
Thermal Monitored Scale: -40° to 1832°F
Maximum Loop Resistance: 50MΩ
Maximum Capacitance Scope: 400 µF
Industrial Safety Certification: CAT III 600V
Chassis Drop Protection: 6.6 ft. (2 m)
Display Interface Profile: 4000 Count Backlit LCD
Power Source Requirements: 2 x AAA Alkaline Batteries
Tester Chassis Length: 6.41 in.
Tester Chassis Width: 3.16 in.
Tester Chassis Height: 1.78 in.
Net Diagnostic Weight: 8.2 oz.
Pro-Tip: When shifting your function selector wheel from voltage tracking to high-amperage current logging, pause until the illuminated Lead Alert LED flashes; this visual confirmation validates that your probe positions match your chosen testing loop parameters.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 9843812647

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.8 ★★★★★
Based on 5 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
T
Verified Purchase
Tom Bateman
Draper, US
★★★★★ 5
Honda filters
Style: 2.0L
Excellent quality. Fit perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
H
Verified Purchase
Hayley
Waukegan, US
★★★★★ 5
Perfect for 24 CRV
Style: 1.5L
Worked perfect in my car and saved me some money!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
A
Verified Purchase
Ayra G.
Birmingham, US
★★★★★ 5
Savings!
Style: 2.0L
Very affordable and fits like the factory one. Don’t pay the dealer hundreds! Just do it your self.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 2
Not compatible with Honda CRV 2023
Style: 1.5L, Style: 1.5L
Pretty disappointed that the description did not match what my car actually needed. THIS IS NOT COMPATIBLE WITH A HONDA 2023 CRV Engine Air filter… Just glad the cabin air filter worked. Having to buy another one… The image attached is what I needed to replace.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 18, 2026
M
Verified Purchase
Mi
Los Angeles, US
★★★★★ 5
Reliable, Eco-Friendly, and Great Value Air Filter
Size: 64115a1bdb6&13718691835, Size: 64115a1bdb6&13718691835
Very satisfied with this air filter! It fits perfectly and was easy to install without any hassle. The filtration performance is impressive—helping to keep the air inside the car fresh and clean. The simple packaging is eco-friendly, which I appreciate. Reliable quality and reasonable price make this a great choice for regular replacement. Highly recommended!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026

recommand products