Klein Tools MM420 Multimeter
Where to Buy
| Retailer | Price | Last seen | Buy |
|---|---|---|---|
 Bonanza | $39.00 | Dec 26, 2022, may have changed | Buy Now |
 Amazon 30-day returns (in store too) | $49.65 | Aug 25, 2024, may have changed | Buy Now |
S Summit Racing -> eBay | $54.97 | Apr 12, 2024, may have changed | Buy Now |
 Walmart Sold by Rons Home and Hardware | $71.63 | Apr 9, 2023, may have changed | Buy Now |
Prices are collected from retailer listings; each row shows the date we last saw that price. Return and shipping terms are each store's standard policy from our retailer research (April 2026). Some products and categories have different terms, so check with the store before you buy.
Used & Refurbished
✨ See 2 used & refurbished prices with ShopSavvy ProGet the app →Price history summary
We recorded no new price at major retailers (Amazon, Walmart, Best Buy, Target, The Home Depot and Lowes) in the last 90 days.
Range over the last 12 months: $52.99 (retailers/amazon, Feb 7, 2026) to $64.98 (retailers/amazon, May 22, 2026). Based on 94 recorded prices since Oct 20, 2025 for offers sold by these retailers themselves (not marketplace sellers). Summary as of Oct 16, 2026.
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Pros
- •The unit is very versatile and suitable for various electrical testing needs.
- •Large, easy-to-read display with a backlight makes it convenient for use in different lighting conditions.
- •Offers temperature and capacitance measurements, which are not common in meters under $50, adding extra functionality.
- •Well-constructed and rugged design, ideal for both professional and DIY use.
- •Includes high-quality test leads with safety caps, thermocouple, instructions, and batteries—providing good value.
- •Typical measurements like voltage (e.g., 220V) are accurate, according to user reviews.
- •Features a kickstand for stability during use.
- •Suitable for both beginners and experienced users due to its user-friendly interface.
- •Reliable performance consistent with more expensive multimeters.
- •The auto-ranging and TRMS features help ensure precise readings across various signals.
Cons
- •The instructions are extremely poor and can be confusing for beginners, often requiring additional external resources.
- •Does not come with a carrying case despite some descriptions implying it might; requires an extra purchase if needed.
- •Some users found the initial setup or operation a bit daunting without prior experience.
- •No significant negatives reported about its core functionality, but the lack of comprehensive guides could be a minor hurdle for novices.
Bottom Line
The Klein Tools MM420 is a solid, well-built multimeter packed with features like temperature and capacitance measurement, making it a versatile choice for both pros and DIY enthusiasts. It offers good accuracy, durability, and value, especially for those who don’t mind wading through poor instructions. If you're a beginner looking for straightforward operation with comprehensive features, this model performs reliably. However, if you want a more beginner-friendly starting kit with better documentation, you might consider a model with more detailed user guides or a carrying case included.
What Reviewers Are Saying
📚More About Klein Tools MM420 Multimeter
Discussion
ShopSavvy compares prices across thousands of retailers so you always get the best deal. Prices are collected from retailer listings, and each one shows the date we last saw it. Our expert reviews and community discussion help you make informed buying decisions.