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Wagner MMC220 Moisture Meter

Our Score:

Wagner Meters MMC220 At a Glance

As with all pin meters, it can be very difficult to insert the pins far enough into hardwoods to obtain accurate readings. Attempting to do so often results in bent or broken pins. Also, short pins will not reach far enough towards the center of thicker slabs where higher moisture is found. According to the United States Department of Agriculture, boards should be read at a depth of one-fourth to one-fifth of its thickness.

The Delmhorst J-2000 is a digital pin-type meter that can be used for measuring moisture in wood and other building materials. This meter is intuitive to use and has a rugged build that should stand up well to a lot of use. Accuracy test results indicate that this meter has some limits. Readings tended to be high when MC falls below 8% MC. Readings for some species, such as Ponderosa pine and Douglas fir, tend to be low when MC is above 10%. In addition, the J-2000 does not maintain its accuracy when surface moisture is present.

Even though this meter has some issues with accuracy, as noted above, it is intuitive and easy to use, plus its rugged, durable design makes it a reasonable choice for many applications where a pin-type meter is preferred.


  • Intuitive, easy-to-use.
  • Capable of being used with a variety of building materials.
  • Built-in calibration check.
  • Built-in wood species and temperature corrections.
  • Ergonomically designed with sturdy construction.


  • Issues with accuracy below 8%.
  • Questionable pin durability.
  • Range does not extend below 6%.
  • Surface moisture affects readings.


Objective Evaluation – Overall Score 3.0 out of 5.0

Accuracy – 3.6 out of 5.0

This meter provided reasonable accuracy, although it tended to give high readings below 7% MC when compared to ASTM D4442 oven-dry standards. In addition, above 10% MC, there was a tendency for readings to be somewhat low for pine and Douglas fir samples, when compared to ASTM D4442 standards.

Learn about our accuracy test procedures

Surface Moisture – 1.0 out of 5.0

Surface moisture caused this meter to post readings about 12% higher than the baseline. These surface moisture results indicate that operating this meter in high humidity environments where condensation may form on the surface could lead to highly questionable readings.

Learn about our surface moisture test procedures

Meter Temperature Test – 4.0 out of 5.0

Meter temperature had some effect on this meter’s readings at both low MC and high MC. For example, a low meter temperature of 34.8° F in the presence of low MC decreased the reading by about 1.9% MC compared to the room temperature reading. A high meter temperature of 110° F in the presence of low MC decreased the reading by about 1.4% MC.

Learn about our meter temperature test procedures

Wood Temperature Test – 2.5 out of 5.0

Wood temperature affected this meter’s readings, especially at low temperatures. At a low wood temperature of 33.6° F in the presence of high MC, the reading changed about 5% MC when compared to the room temperature reading. In the presence of low MC, the reading decreased by about 6% MC.

Learn about our wood temperature test procedures


Reading Repeatability – 2.0 out of 5.0

The readings of this meter were not repeatable, showing some tendency to vary.

Learn about our repeatability testing procedures

Drift Test – 5.0 out of 5.0

Readings for this meter showed no tendency to drift after about 3 seconds.

Cable Interference – N/A

The cable interference test was not conducted for this meter.

Learn about our cable interference and drift testing procedures

Subjective Evaluation – Overall Score 4.0 out of 5.0

Learn about our subjective testing procedures

Ease of Use – 4.7 out of 5.0

This meter is intuitive to use. Little or no use of the manual is needed to operate it. The manual itself provides excellent documentation for resolving issues while using the J-2000.

Quality – 4.3 out of 5.0

Sturdy, durable construction. The meter itself is unlikely to break or malfunction with normal use. However, pin durability could have been better as we experienced problems with pin breakage during our testing.

Comfort – 4.5 out of 5.0

With an ergonomically-designed shape, this meter fits nicely in one’s hand. It is not compact enough to fit easily into a shirt pocket, but it does come with a sturdy case to protect the meter when transporting it from one job site to the next..

Versatility – 3.0 out of 5.0

This is a single-mode meter (pin), which is typical. Readings on the display must be viewed upside down, which is not convenient. Capable of giving relative readings in a variety of non-wood building materials.

Range – 3.7 out of 5.0

The J-2000 reads from 6% to 40% MC. It is not capable of taking measurements at very low moisture levels below 6%.

Features – 3.2 out of 5.0

Readings using the analog display are precise to the nearest 0.1%. Includes a built-in calibration check, and built-in corrections for wood species and temperature. Lacks a HOLD function and low battery indicator.

Customer Service – 4.5 out of 5.0

Delmhorst’s customer service was knowledgeable, helpful and polite. The representative was able to answer all the basic questions about repairs, returns, etc. Fast response to both telephone and email inquiries. Manual available online.


Warranty and Repair Information:

  • One-year warranty on all Delmhorst meters, and a 90-day warranty for optional electrodes.
  • The meter must be physically inspected before the actual repair cost can be determined.
  • 3-5 business day turnaround on repairs.

Our review is based on Moisture Meter Experts independent evaluation of the meter, which was purchased by Moisture Meter Experts or provided free of charge by the manufacturer. By purchasing this meter through the links above, Moisture Meter Experts may be compensated either by your purchase directly from Moisture Meter Experts or from commissions from an affiliate. View our Review Procedures section to learn more about our proprietary evaluation procedure and expertise in the field of moisture meters.