Review on 🍺 Triple Scale Hydrometer Kit for Homebrewing Enthusiasts. Ideal for Beer, Wine, Juice, Cider. Effortlessly Measure Specific Gravity, BRIX, and Potential Alcohol. Complete with Test Tube. An Essential Tool for Crafting Superior Brews! by Brenda Perry

I've been using this for several months and finally ran more detailed calibration tests to ensure my readings are accurate (trying to calculate the efficiency of my brewhouse). I checked closely to confirm that the instructions say I should test in 60F water, but that wasn't the case for my test. That's when I noticed that the scale of a real hydrometer reads "68F" (see figure). It's confusing enough, but when I tested the 68F water it was still off, I ended up measuring 1.00 in 80F water. Anyway, it now appears that all my measurements so far have been wrong. However, I think the discrepancy between the guide and hydrometer should be corrected, 8 degrees difference is enough to have an effect. In general, you should carefully review your measurements and adjust accordingly.