I purchased this refractometer for use in brewing hard cider. The recipe I'm using involves adding sugar and then boiling down the juice by about 1/3. After reducing the liquid, the specific gravity is above the maximum (1.120) for this refractometer; there's no blue in the eyepiece at all.
My [got C's in high school chemistry in the 1970s] brain thinks that if I mix equal parts test liquid and deionized water, then double whatever is to the right of the decimal, I should arrive at the correct measurement. For example, if the 1:1 diluted liquid measures 1.096, the undiluted S.G. would be 1.192. Is this right, or am I nuts?