Looks solid. Easy to use. I love that they include a small screwdriver to turn the calibration screw. I calibrated it and everything has been fine ever since. I can't tell you how many glass hydrometers I've broken. I keep one safe in the box now (only use it to confirm calibration from time to time). I'm only taking off a star because the case could be better. It works but seems like it will break or open if you drop it.
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