Powerful desktop software for downloading, viewing, printing, and storing measurement data. No internet connection required.
The PosiTest CMM arrives fully calibrated and ready to measure. A Test Certificate is included, which documents actual readings taken by your instrument at our calibration laboratory on concrete blocks with the moisture content determined gravimetrically (percentage of dry weight) as described in ASTM F2659.
Beware of ‘Certificates’ or ‘Certificates of Conformance’ offered by competitors. These typically do not include actual instrument readings, and are often insufficient to meet common quality requirements.
The PosiTector CMM IS measures concrete moisture as described in the ASTM F2170 test Method. It involves drilling a hole into the concrete (generally 40% of the depth of the slab), and using an electronic relative humidity probe to quantitatively measure the moisture directly in the slab. It is a destructive test that requires at least 24 hours of being in-situ before an acceptable reading is taken.
The PosiTest CMM measures concrete moisture as described in the ASTM F2659 test method using a non-destructive electronic impedance meter to instantaneously measure comparative moisture content within the top ¾” of a concrete slab.
Find the following helpful videos and articles to better understand concrete moisture measurement with in-situ probes or concrete moisture meters.
In-Situ concrete RH probe resources:
Video — "How to Measure Concrete RH (ASTM F2170) with the PosiTector CMM IS In-situ Concrete Moisture Meter"
Article — "How to Measure Concrete RH (Relative Humidity) in Compliance with ASTM F2170"
Concrete moisture meter resources:
Video — "How to Measure Concrete Moisture using the PosiTest CMM Non-Destructive Concrete Moisture Meter"
Article — "How to Non-Destructively Test the Moisture Content of Concrete Slabs"
Before applying a protective coating or other flooring materials to a concrete slab, it is critical to ensure that the moisture level inside the concrete has decreased to acceptable levels—typically ≤75% Relative Humidity (RH), 3 lb/1000 ft2/24 hours MVER, or ≤5% Moisture Content (MC).
If not, moisture can accumulate below the coating or flooring causing discoloration, cupping, buckling, blistering, adhesive failure, and/or mold growth. There are various methods used for concrete moisture measurement. One common method to determine the moisture condition of a concrete slab uses a non-destructive electronic impedance meter, such as the PosiTest CMM—as described in ASTM F2659.
The PosiTest CMM is capable of storing up to 200 readings into memory. It features a USB port and includes a USB cable to download, view, and print stored readings quickly and easily with PosiSoft Desktop.
The PosiTest CMM Concrete Moisture Meter stores each saved reading with the reading number—in all three available units (concrete 0-6%, carbide 0-4%, and relative).
The PosiTest CMM features three different measurement scales:
• Concrete 0 to 6%: This scale is calibrated using the gravimetric method (percent dry weight).
• Carbide Method 0 to 4%: This scale is equivalent to the carbide method.
• Relative 0 to 100: Used for taking readings for reference comparisons. This scale does not indicate moisture content or humidity.
The PosiTest CMM features three different measurement modes:
• Continuous Measurement Mode is the default mode and continuously updates the display with the current measurement value.
• Hold Max Mode displays and holds the maximum reading until the memory button is pressed to save it, or the power button is pressed to discard it.
• The innovative Hold Max and Save Mode waits for the reading to stabilize, then automatically saves it into memory.
The PosiTest CMM uses two AAA batteries. Typically, operation life extends to 30 hours—ideal for all day use.
The PosiTest CMM includes a Check Standard to verify the meter’s operation and accuracy. The PosiTest CMM is placed onto the Check Standard and the reading is checked against the range written on the standard.
Yes. The PosiTest CMM’s readings can be downloaded, viewed, and printed quickly and easily with PosiSoft Desktop, a free download.
Fully customizable reports can be created to match existing paper forms or layouts. If other DeFelsko instruments such as the PosiTector CMM IS, PosiTector 200, or PosiTector DPM are used on the same job, measurement data can easily be compiled into one report.
PosiTest CMM Concrete Moisture Meters include a Test Certificate with no expiry or end date. They have no shelf life, therefore the length of time in the field is not a good indicator for recertification intervals. Many organizations with quality programs and recertification programs require annual recertifications, and this is a good starting point for most users. DeFelsko recommends that customers establish recertification intervals based upon their own experience and work environment. Based on our product knowledge, data, and customer feedback, a one year recertification interval from the date the instrument was placed in service is a good starting point.
This lightweight device increases the utility of the PosiTest CMM allowing for quick and easy concrete moisture measurements on large surfaces without the need to bend or kneel.