Well, whatever units you want to use, it did work. Made up a solution last night and my hydrometer gave me a reading of 1.040. I recently got a Tilt hydrometer. In plain water it was zeroed out. Put it in wort and there was a wide discrepancy between what my hydrometer was saying and what the Tilt was saying. After testing the hydrometer last night, I was able to email Tilt. They responded today and a replacement is on the way, no questions asked. The person I was in touch with said that it was probably not calibrated properly. Nice to be able to relay a good customer service story! And Sean and Rob, thanks so much for your help!