If you don't know the specific gravity of your float tank solution, it makes it really difficult to make sure you're providing an accurate float experience to every customer. Hydrometers are tools built specifically for this, but not all hydrometers are created equal. What types of hydrometers should you use and what do you need to look out for? Fortunately, Graham and Ashkahn have a lot of experience shopping for hydrometers (they break fairly easily, unfortunately) and are more than happy to share what they look for in these little measuring devices that help us make the magic happen.