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Waaaaaait. So the plaster is shit-quality for install, and they're trying to blame the chem care?
If you just need to show that's it's stupid, rediculously high without needing to know what exactly it is (e.g. being able to say 'this shit is over 11!' Is just as effective as saying 'this shit is 11.3!') you can use litmus/pH paper. They go from 0-14 with pretty damn distinct color gradients between each level. This pack from amazon let's you kit out 4 trucks for $11.