Model # MO257

Internet #203449697

Extech Instruments Pinless Moisture Meter

Extech Instruments

Pinless Moisture Meter

$209.99 /each

Frequently Bought Together

Product Overview

Pin less Moisture Meter for non-invasive measurement in wood and other building materials with virtually no surface damage. Measurement depth from 078 in. (20mm) to 1.6 in. (40mm) below the surface. Two user-settable alarm levels with audible beeper and visual flashing RISK or WET indicators. Triple backlit LCD. Complete with 3 AA batteries and pouch case.

  • Non-invasive moisture content measurements in wood or building materials
  • Relative pinless moisture reading for non-invasive measurement from 0.0 to 100.0 with 0.1 resolution
  • Multifunction backlit triple LCD display
  • Pinless measurement depth from 0.78 in. (20mm) to 1.6 in. (40mm) below the surface
  • High frequency sensing technology
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Info & Guides

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Warranty / Certifications

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Customer Reviews

Rated 4.7 out of 5 by 23 reviewers.
Rated 4.0 out of 5.0 by Great Meter easy to use takes the guessing out of wondering if a wall is damp Great Meter easy to use takes the guessing out of wondering if a wall is damp. This is a handy tool to keep if you want to know if a stain wall is still damp or old stains . Makes the trouble shooting very easy to determine what course of action you should take to make repairs. Nice case to keep meter safe . November 5, 2014
Rated 5.0 out of 5.0 by Non-invasive, easy to use. If you are interested in tracking a water problem or leak, or other type of moisture problem, but don't want to tear holes in everything, try this. An easy-to-use pinless moisture meter. The Extech MO257 Moisture Meter will discover and measure moisture content up to about 1.5 inches in depth without having to make holes in the surface. The meter has a large display, is easy to use, and comes with a case and good instructions. You even have a pocket on the front of the case where I keep the instructions. There is a Moisture Comparison Table in the instructions that will show you what type of moisture to expect in different types of materials. Each time you turn it on, it will calibrate itself. If you measure different materials, it is best to recalibrate again; just turn it off and back on. Check the specs as there are lots of features such as backlit display, Hold display, MAX and MIN settings, alarm, etc. It uses 3 AAA batteries which are already provided. You will need a screwdriver to change batteries. I used it on different surfaces, different materials and different rooms/areas. It is very sensitive and appears to be quite accurate. You will have to get used to the way it detects and what to expect under different uses. Moisture exists in a lot of places. You have to differentiate normal moisture from abnormal moisture. Hence the table in the instructions. Overall a great tool for inspectors, contractors, and others seeking moisture problems using non-invasive methods. February 17, 2015
Rated 4.0 out of 5.0 by Accurate readings. Easy to operate, no frills pinless moisture meter. There are three common types of moisture meters used for the inspection of building and structure materials: pin-type, pinless and pin/pinless/all-in-one. This one is pinless, which unlike the pin-type, is non-invasive and causes no damage to walls or building materials. 3-AA batteries are preinstalled, allowing for use of the meter as soon as its removed from the plastic retail case. A black nylon carrying case is included. Calibration is quickly and easily accomplished, quite literally, with the press (and hold) of a single button. Included instructions are well-detailed and easy to read. The meter features a large LCD display that is easy to read, even in low light due to backlighting. My preference is for a slightly brighter backlight, but most will find the provided level of backlight is sufficient. A rubberized exterior hard case provides for a positive grip and is ruggedized against accidental drops and damage. With an effective range/depth of up to 1.6-inches, this meter is more powerful than many pin-type meters, and is ideal for accurately measuring moisture content in common structures and materials around the home, such as in wood, concrete, and drywall and plaster walls and ceilings. Audible and visual readouts provide moisture content and indicate whether the material is wet or dry or at risk, which eliminates guess work. This meter is a must-have for contractors and home inspectors, but as a DIY homeowner, with a relatively new home, this is not a device I’ve personally had a lot of need for, however it’s handy when trying to determine if conditions are appropriate for installation of expensive new flooring, to locate leaks behind walls and in ceilings, or to assess damage to structures caused by excess moisture. To take a reading, simply calibrate the meter and place the measurement sensor in direct contact with the material being tested. Within a few seconds, the results are displayed on the LCD screen, without having to drive pins into the material being tested. This is a basic, no frills moisture meter in that it doesn’t measure air and surface temperature, relative humidity, grains per pound/gram or vapor pressure. Some more advanced meters even allow you to select the species of wood or type of building material, for a more accurate reading. Although it allows you to take a reading at any angle, an advantage over meters that need to be placed flat against a surface, the non-retractable nature of the measurement sensor makes this meter larger and more awkward in appearance than I’d like for it to be. Minor quirks aside, IMO, the quality of this meter is on par with meters costing more, and is ideal if you don’t need it to do more than detect the presence of moisture. February 3, 2015
Rated 5.0 out of 5.0 by How dry it is... This meter is designed to quickly sweep large areas looking for excess moisture in drywall and wood. It gives a relative readout between 0 (dry) and 100 (wet), but is not calibrated for exact percentages. A table in the manual gives some general guidance - drywall is dry below 30, wood is dry below 50, and cement is dry below 25. You have to calibrate it before every use, which takes about 6 seconds. It does detect moisture in humans, so you will need to recalibrate if you change your hand position on the meter. The other controls are easy to use. You'll probably only set the alarm ranges once, but you'll want to keep the manual handy. There's a two-step process to turn it on - first press the power button, and then it won't do anything until the "MEAS" button is pressed to start the calibration process, after which measurements can be taken. Pressing MEAS again will freeze (HOLD) the reading - a convenience when measuring in spots where you can't read the display. For some reason the meter automatically turns off in 30 seconds after taking a HOLD reading unless you press MEAS again to release the hold. The normal auto-off period is a generous 30 minutes. In my 26-year-old house, I swept around all windows, doors, and skylights, as well as all the plumbing fixtures. I not find any leaks. I plan to recheck every six months. While scanning my house, I discovered that it thinks metal is wet - curtain rods and drywall metal corner bead would send the meter over 40 and trigger the "risk" alarm. I checked my dry firewood and it measured between 20 and 30. Really dry wood (indoor furniture) measured between 5 and 15. Dry lumber measured between 15 and 20, so I'll assume that anything under 20 is suitable for woodworking or construction. I have a cement basement floor and it measured between 50 and 60, well over what the manual considers wet. One weird thing - a mini-CD was included that said it contained product manuals, but a printed User's Guide was included and the mini-CD was an unwritten CD-R. November 2, 2014
Rated 5.0 out of 5.0 by Very Handy for Large Jobs This is a great meter for water & mold remediation jobs. Unlike a typical moisture meter, this unit runs a scale from 1 (DRY) to 100 (DRIPPING WET) There is a scale in the users manual that will give you a conversion to percentages. It also measures to almost 2 inches deep. I've been using this on large water jobs from a leaky roof to burst water pipes. I sweep large areas and mark them off with a marker so the crew can come in and remove the offending drywall and insulation right away and position fans where they need to be. You can also use this during and after cleanup to make sure your in the safe zone.. Its a good sturdy meter at what I thought was a reasonable price, December 31, 2014
Rated 5.0 out of 5.0 by Very Useful Meter This is very handy to have especially if you are a homeowner in a rainy climate. All you have to do is rest the metal sensor against a surface and it will register the degree of moisture in the wall or wherever you want to test. It also comes with a disk and instructions explaining how to use the meter. For my purposes I've found it quite useful, especially for areas where rain my leak in from ouitside, walls containing electical wiring, and possible indoor leaks. It gives me some peace of mind knowing that I can detect moisture and correct the situation before it becomes a more serious problem. December 24, 2014
Rated 5.0 out of 5.0 by Great for finding out when things have dried out I got this because I work in a school in a high rise and we have periodic water events from overflowing toilets to water coming down from above. We have had clean up firms come in that used similar meters to determine what was wet and when it was dry. I've always wanted one. This one works well. I've used it on drywall and ceiling tiles so I could find out when they were dry and could take the fans off and it worked well. It is easy to use. You push a button and hold it in the air to calibrate it then put it against the surface you want to test. For my purposes it works very well. January 1, 2015
Rated 1.0 out of 5.0 by Didn't work It seemed to work the first day the. After that it went crazy and just kept showing all different numbers and didn't stop. I am returning it July 7, 2015
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