I just got my TF100 kit and CH was very high, with these results:
CH 575 (10 ml test)
I was surprised by the CH and measured it several times. Then I had Leslies measure CH twice on 2 different days with 2 different employees and they got CH = 260 and 270. I had a friend measure with his older TF100 kit with the 25 ml test and he got CH=380. I used my new kit with the 25 ml test and got CH=480. Any ideas on what test to believe?
I do have etching on my plaster that has been getting progressively worse or widespread starting a few years ago shortly after a replaster job. The etching is patches of very rough surface, like 40 or 80 grit sandpaper, and the cleaner picks up sand grain sized pieces of white plaster, maybe I scrape it off when I brush.
I appreciate any feedback.