UIUZMAR pH Meter for Food, pH Pen Tester Bread Yeast, Digital pH Temp Meter for Sourdough Starter, Backlit Food pH Tester for Sushi, Fermentation Food, Canning Food, Cheese, Meat, Semi-Solid Samples

I purchased this to keep a better ey on our hot tub, followed the instructions to the letter and set the chlorine level to belowe that advised for hot tubs, I just felt it was telling me to put far to much chemical in.Users then reported the a stronger smell than normal and some some skin irritation, ordering in some stick testers it was found to be well over the recomended does, even though it ws still saying I should add more.I have sent it back, the calabrated from factory is obviously not the case.