my deep six is right on.. I used both a floating hydrometer and the deep six.. Both results matched up perfectly everytime.. I have been tempted to get a refracto but with 2 being the same I figure how can 2 different hydrometers be the same if it was not what is was reading... BTW
the floating hydrometers hurt worse when you step on them barefooted... I like my Deep Six and would recommend it for anyone but would suggest having a backup for hyposalinity as the deep six only goes to 1.010 and hypo needs to be 1.009... That is the reason why I had the floating one but unfortuntly my foot liked it better than I did.. BTW
stepping on it caused my leg to go numb for an entire day...