SCVJeff wrote:
I use one to check Salinity in my reef tank, and it takes exactly 1 drop of water but works great. But being acid, one drop can drill a hole right through your pants too.
The "mess" I would anticipate is dumping the acid and cleaning the device for each cell. I'm pretty skillful with a hydrometer, what goes in gets put directly back in each cell. At the end of all measurement, I grab a bottle of water and give the hydrometer a triple rinse and back into storage it goes. My batteries have good top side access so the hydrometer tube never comes out of the cell.
I hear stories on the Forum about clothing full of holes but I don't have those issues.