Yes, it is a maple syrup Hydrometer. No, I have not had it calibrated, as I have nothing to calibrate it with, unless I bought another one. Is there a different way to calibrate it? I do know it is very clean with absolutely no cracks or niter on it. There is no time for the syrup to cool as I test it often directly from the stock pot I use to finish the syrup on propane. I can fill the stainless tester tube with one scoop of syrup, so it's a very fast test from pot to tester.
One thing I haven't done is the cold test. Can I test some of last years syrup I have in storage?
Thanks again folks!