Is the Klein Tools ET140 Moisture Meter worth it?
A top pick in Test, Measure & Inspect on Amazon (#13 when we checked, Oct 24, 2026)
Worth it if you need a compact, noninvasive way to check relative moisture in drywall, masonry, hardwood, or softwood. It reads up to 3/4 inch deep and gives you both a reverse-contrast display and nine LED bars to interpret the moisture range.
Good to know: If you need readings beyond those four calibrated materials or a precise laboratory moisture percentage, look for a meter designed for that job.
A pinless moisture meter for quick, noninvasive checks
The Klein Tools ET140 Moisture Meter solves a simple problem: checking behind a surface without putting holes in it. Its pinless design uses an electromagnetic field to detect relative moisture up to 3/4 inch deep, so you can scan drywall, masonry, hardwood, and softwood without driving probes into the material.
That depth changes the job. A damp patch may not show its whole story right at the surface, while this meter is designed to sense below it. Select the material mode, place the meter against the surface, and read the result on the bright reverse-contrast display. The nine LED bars add a quick visual indication of the moisture range, which is useful when you are moving across a wall or checking several areas.
The honest boundary is material selection. The listing says the ET140 is calibrated for drywall, masonry, hardwood, and softwood only. Use it as a relative moisture checker for those surfaces, not as a universal meter. Hold, low-battery, audible-alert, and auto-power-off functions round out the daily workflow. That is a practical tool for maintenance checks, leak follow-up, and deciding where a closer inspection belongs.
You get the meter, a 9V battery, and an instruction manual in a compact 7-ounce package. Its pinless design can replace guesswork and avoids making probe holes during routine checks.
Great for
- Checking drywall after a suspected leak or flood
- Scanning hardwood or softwood before repair work
- Comparing moisture areas across masonry surfaces
- Maintenance jobs where pin holes are not wanted
Maybe not for you if
- You need calibration for materials outside drywall, masonry, hardwood, or softwood
- You need a laboratory-style moisture percentage rather than a relative range
- You prefer a meter built around deep or specialized material testing
The Klein Tools ET140 is a sensible buy for homeowners, maintenance workers, and DIYers who need quick relative moisture checks without damaging a surface. It is especially suited to drywall, masonry, hardwood, and softwood, with detection up to 3/4 inch deep and a display that combines numeric viewing with nine LED bars. Keep the material calibration limit in mind, and treat the result as a relative reading rather than a precise percentage. For the right inspection job, it puts useful information in your hand quickly.
Amazon shoppers rate it 4.5 out of 5 across 6,279 ratings. That is their number, not ours.
Quick answers before you buy
What materials can the ET140 measure?
It is calibrated for drywall, masonry, hardwood, and softwood. Select the matching material mode before taking a reading.
How deep can it detect moisture?
The listing specifies noninvasive detection up to 3/4 inch, or 19 mm, deep using electromagnetic field technology.
Does it use pins?
No. The ET140 is a pinless meter, so it checks relative moisture without inserting probes into the material.
What comes in the package?
The kit includes one ET140 moisture meter, one 9V alkaline battery, and an instruction manual.
Does it turn off automatically?
Yes. Auto-power-off is listed as a feature, along with hold, low-battery indication, and an audible alert.
The spec sheet, for those who want it
| Part Number | ET140 |
|---|---|
| Item Weight | 7 ounces |
| Product Dimensions | 6 x 2.5 x 1 inches |
| Batteries | 1 Unknown batteries required. (included) |
| Size | One Size |
| Color | Moisture Meter |
| Style | Moisture Meter |
| Finish | Brushed |
| Material | ABS Plastic |
| Pattern | Moisture Meter |
| Shape | Rectangular |
| Power Source | Battery Powered |
| Voltage | 9 volts |
| Item Package Quantity | 1 |
| Display Style | Bright Reverse-Contrast Display and a Nine LED Bar Graph |
| Mounting Type | Surface Mount |
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