Quote Originally Posted by Willen View Post
Are you running an electronic refractometer, or an optical unit?
Optical.

When I posted my syrup yield from the gallons I boiled, another poster said that would be 3.07% sugar concentration. I went out and check my sap and the refractometer said it was 3%. That is why I trust it to some degree. It said 4% both times I checked the same pail and correctly repeated the 3% for the other.

I would not bet my friend’s truck that it is an accurate reading, I was just curious if it is possible or likely?