The Front Desk Review

Klein Tools · Updated June 2026

Klein Tools MM400: price & specs

Klein Tools MM400. Every price and spec below is linked to its source and dated — no guesses.

Source: kleintools.com verified ✓ corroborated verify in ledger

On the Recordsourced & dated · eligible
See Klein Tools MM400 on Amazon Live price at the store — may differ from the dated listed price above. As an Amazon Associate we earn from qualifying purchases.
Klein Tools MM400 — Klein Tools
Image: kleintools.com (© Klein Tools)

Is the Klein Tools MM400 a good buy?

At $55, the Klein Tools MM400 is #3 cheapest of the 11 multimeters we track, where the median is $86.49. On the spec sheet, its max voltage dc of 600 V is the lowest of the 12, and its count resolution of 4000 is at the median of the 12.

Evidence of Record

Our data

No independent lab has measured this product yet. 1 outlet has it on record by mention only, with no hands-on measurements published to weigh its claims against — a gap in the evidence, not a verdict on the product.

A coverage record, not a rating. How we count

Review consensus · sourced & dated

What reviewers say about the Klein Tools MM400

Only one whitelisted tester (Pro Tool Reviews) covers the exact MM400, and only as a qualitative pick in a multimeter roundup, with no lab measurements. It names the MM400 'Best for Home Use,' praising auto-ranging, broad functionality, and a rugged drop-resistant build at a budget price. No hands-on accuracy testing or negatives were published.

Based on 1 review · 2024-01-09

Tested by Pro Tool Reviews

Consistently praised

  • Auto-ranging removes setup guesswork
  • Rugged, drop-resistant construction for its price point
  • Broad measurement functionality (AC/DC voltage and current, capacitance, temperature, frequency)

Where reviewers disagree Single-source only: Pro Tool Reviews' roundup blurb is spec-driven and entirely positive, with no lab measurements and no second tester to corroborate or challenge the durability and accuracy claims.

The sources (1)

Pro Tool Reviews hands-on ·

We also love the fact that it comes with automatic ranging, eliminating any guesswork when setting it up.
The MM400 is also one of the tougher multimeters at its price point.
Thanks to a rubberized coating on the exterior, it can survive drops of up to 1 meter unscathed.

Specifications

Price (US)$54.97 Street price (discontinued; replaced by MM420)
BrandKlein Tools
Released—
Typedigital handheld
True rmsNo
Max voltage dc (V)600
Count resolution4000
Auto rangingYes
Cat safety ratingCAT III 600 V
Temperature measurementYes
Low impedance lozNo

Source: kleintools.com (verified 2026-06-20) · corroborated by data.kleintools.com. Klein Tools product page (now showing 'no longer in production', recommends MM420) confirms non-TRMS, 4000-count LCD, 600 V DC, CAT III 600 V, auto-ranging, and temperature measurement. Street price ~$54.97 from distributors.

Is the Klein Tools MM400 worth it vs cheaper multimeters?

Klein Tools MM400 against its closest cheaper and pricier multimeters on the specs that matter — every value sourced. See all 11 ranked

ProductPriceTypeTrue rmsMax voltage dc (V)Count resolutionAuto ranging
Klein Tools MM400 this$54.97digital handheldNo6004000Yes
Amprobe AM-510$47.95digital handheldNo6004000Yes
Extech EX330$74.99digital handheldNo6004000Yes

Frequently asked questions

What do reviewers say about the Klein Tools MM400?

Only one whitelisted tester (Pro Tool Reviews) covers the exact MM400, and only as a qualitative pick in a multimeter roundup, with no lab measurements. It names the MM400 'Best for Home Use,' praising auto-ranging, broad functionality, and a rugged drop-resistant build at a budget price. No hands-on accuracy testing or negatives were published. Praised: Auto-ranging removes setup guesswork; Rugged, drop-resistant construction for its price point; Broad measurement functionality (AC/DC voltage and current, capacitance, temperature, frequency). (From 1 tester review.)

How much does the Klein Tools MM400 cost?

The Klein Tools MM400 has a US price of $54.97 (Street price (discontinued; replaced by MM420)), as of 2026-06-20.

How does the Klein Tools MM400 compare on price?

At $55, the Klein Tools MM400 is #3 cheapest of the 11 multimeters we track, where the median is $86.49.

What are the Klein Tools MM400's key specs?

Klein Tools MM400 (Klein Tools): type digital handheld, true rms No, max voltage dc v 600, count resolution 4000, auto ranging Yes. Full sourced spec sheet verified 2026-06-20.

Price of record: $54.97 at kleintools.com, 2026-06-27. Other retailers may be lower — check the current price:

See Klein Tools MM400 on Amazon As an Amazon Associate we earn from qualifying purchases.

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