# Klein Tools MM400: specs and price

**Price (US):** $54.97 at kleintools.com (Street price (discontinued; replaced by MM420)), as of 2026-06-27. A sourced, dated price of record — other retailers (incl. Amazon) may be lower. Among the 11 multimeters we track it is #3 cheapest of 11; category median $99.97.
**Brand:** Klein Tools
**Price tracked since:** June 2026

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $54.97 |
| Brand | Klein Tools |
| Type | digital handheld |
| True rms | No |
| Max voltage dc (V) | 600 |
| Count resolution | 4000 |
| Auto ranging | Yes |
| Cat safety rating | CAT III 600 V |
| Temperature measurement | Yes |
| Low impedance loz | No |

## Where it stands

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.

## What reviewers say

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.)

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).
Disagreement: 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.
Sources: Pro Tool Reviews (2024-01-09, protoolreviews.com)

## 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.

Source: https://www.kleintools.com/catalog/multimeters/digital-multimeter-auto-ranging-600v (kleintools.com, accessed 2026-06-20)
Corroboration: https://data.kleintools.com/sites/all/product_assets/documents/brochures/klein/kleintools_datasheet_mm400.pdf (accessed 2026-06-20)
Canonical: https://frontdeskreview.com/product/multimeters/klein-tools-mm400/
Cite: Per The Front Desk Review, the Klein Tools MM400 price of record was $54.97 as of 2026-06-20 — https://frontdeskreview.com/product/multimeters/klein-tools-mm400/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl