A carpet inspector often needs to perform tests on the job, so they need to know exactly what is needed and bring with them any equipment that is needed to do the test. Determining pH is very common, especially because it can help diagnose several problems, from pet urine to problems with the subfloor. When testing for fiber pH on site, there are two methods that carpet inspectors can use.
The first pH test is to do a direct pH measurement in situ. This happens through using a portable pH meter with a flat surface probe. All the inspector needs to do is place the probe on the desired spot. Then it gives a reading to the screen. Inspectors can also use pH test papers by wetting the carpet with distilled water. They must then agitate the fibers and let everything sit for about five minutes. After touching the paper to the desired area, they will have their results.
A more accurate measurement for pH in carpet requires carpet inspectors to go about desorbing soluble materials from the carpet fibers. Then they need to measure them in a water solution. Both methods are good ways to figure out the pH of carpet fibers. It’s just one of the many tests that carpet inspectors may need to do on-site.

I need a portable meter which can calibrate a PH factor on site. I need a meterewhich will test the water content of concrete slabs, vinyl flooring, Laminated LVT planks and hardwood planks.
Do have something which will measure that? What is this meter called?
Most moisture meter manufactures have pH calibration solutions. Or, you can some on Amazon here: https://amzn.to/3ZjtptU.