Calcium Chloride Moisture Test Kit Value Pack 3 Pack - Concrete Moisture Test - Includes Custom Log Sheet

This was a quality test kit. You will need a scale with a 0.1 gram resolution, which I didn't, so I mailed the trays to Taylor Tools and got results back in ~ 4 days.Be warned, the trays require the use of the included plastic cover secured to the floor with a VERY STRONG adhesive backing, required to prevent outside moisture from entering the tray. I'm a big guy and it took both arms to remove the cover, which then left adhesive mark outlines on the floor. So, don't choose test sites that aren't going to be covered up later....just saying.

Kit was complete, instructions good, easy to use. I used my own scale to weigh after test was complete. It is convenient that you can have verification of results from supplier.

1. After we had already bought the test kits, only then did the instructions advise that we needed a pharmacist's or jeweler's scale to measure weight with precision of 1/10 gram.2. When the 60-72 hour test period was finished and I pulled-up the sealed plastic coverings, the sealant left a permanent stain with black tar-like residue on the concrete (see photo).3. Then, today, as I was researching what the test results mean (when selecting a concrete sealer), I found out that the ASTM testing standard organization no longer recognizes this test method as being reliable.Conclusion: money wasted, test results not reliable, and we are left with black rectangular stains on our patio. We wish we had never heard of this product.