# Klein Tools ET140 Pinless Moisture Meter vs Extech MO55 Combination Pin/Pinless Moisture Meter: specs and price compared

A sourced, side-by-side comparison of the Klein Tools ET140 Pinless Moisture Meter (Klein Tools) and Extech MO55 Combination Pin/Pinless Moisture Meter (Extech) among moisture meters. Klein Tools ET140 Pinless Moisture Meter is the cheaper of the two at $49.97.

## Side by side

| Spec | Klein Tools ET140 Pinless Moisture Meter | Extech MO55 Combination Pin/Pinless Moisture Meter |
| --- | --- | --- |
| US price | $49.97 | $104.78 |
| Brand | Klein Tools | Extech |
| Measurement range pct | 0-100% (relative) | Pin: 5-50% wood, 1.5-33% other materials; Pinless: 0-99% |
| Pin vs pinless | Pinless | Pin and Pinless (combination) |
| Material calibration groups | Drywall, masonry, hardwood, softwood | Wood (low/medium/high), other building materials (low/medium/high) |
| Sensing depth (in) | 0.75 | 1 |
| Accuracy | ±4% | ±(3% of reading + 5 digits) |
| Hold peak function | Yes | Yes |
| Audible alarm | Yes | Yes |
| Display type | Reverse-contrast LCD + 9-segment LED bar graph, 0.1% resolution | LCD with low/medium/high icons |

## Key differences

- Measurement range pct: Klein Tools ET140 Pinless Moisture Meter 0-100% (relative) vs Extech MO55 Combination Pin/Pinless Moisture Meter Pin: 5-50% wood, 1.5-33% other materials; Pinless: 0-99%
- Pin vs pinless: Klein Tools ET140 Pinless Moisture Meter Pinless vs Extech MO55 Combination Pin/Pinless Moisture Meter Pin and Pinless (combination)
- Material calibration groups: Klein Tools ET140 Pinless Moisture Meter Drywall, masonry, hardwood, softwood vs Extech MO55 Combination Pin/Pinless Moisture Meter Wood (low/medium/high), other building materials (low/medium/high)
- Sensing depth (in): Klein Tools ET140 Pinless Moisture Meter 0.75 vs Extech MO55 Combination Pin/Pinless Moisture Meter 1
- Accuracy: Klein Tools ET140 Pinless Moisture Meter ±4% vs Extech MO55 Combination Pin/Pinless Moisture Meter ±(3% of reading + 5 digits)
- Display type: Klein Tools ET140 Pinless Moisture Meter Reverse-contrast LCD + 9-segment LED bar graph, 0.1% resolution vs Extech MO55 Combination Pin/Pinless Moisture Meter LCD with low/medium/high icons

## Sources

- Klein Tools ET140 Pinless Moisture Meter: https://www.kleintools.com/catalog/environmental-testers/pinless-moisture-meter (kleintools.com, verified 2026-08-05)
- Extech MO55 Combination Pin/Pinless Moisture Meter: https://www.extech.com/products/mo55/ (extech.com, verified 2026-08-05)

Canonical: https://frontdeskreview.com/gear/moisture-meters/klein-tools-et140-vs-extech-mo55/
Cite: Per The Front Desk Review, Klein Tools ET140 Pinless Moisture Meter ($49.97) vs Extech MO55 Combination Pin/Pinless Moisture Meter ($104.78) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/moisture-meters/klein-tools-et140-vs-extech-mo55/
License: CC BY 4.0.