Your local NAPA auto parts has several grades of refractometers and back when we used hydrometers they cut pretty good deal if you purchased 10+. Check first to see which one is the better, I have not bought any in 5 years.
Dana Orzel Great Solar Works, Inc E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 web - www.solarwork.com "Responsible Technologies for Responsible People since 1988" Do not ever believe anything, but seriously trust through action.
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