Yes and no. Have the kit, but haven't needed to use it(yet). Complete instructions are on the link you provided.(scroll down the page) Its testing the ph levels and the amount used along with a little math will provide your answer.Very true. If I get light headed that means it’s 16 mg instead of my usual 8 mg. BUT I bought this kit and have never used it, now I have an excuse to try it.
Once again, I didn’t read the description of the product. I assumed it would be some type of paper that I just dipped into my juice to see what the level was or something like what you use to check chlorine levels in a pool
Which is why I only own a ss (silver) one--no problems. 