Properly reading a battery hydrometer
I remember from chemistry that you always read volume in a graduated cylinder at the bottom of the meniscus. But what about the hydrometer? Just got to thinking about it today when I was checking the ...
Forum Discussion
SCVJeff wrote:
I know I'll get cr@p from the battery crowd here, but this "unclear" line has bothered me for years both on battery hydrometers, as well as the one I use floating in my salt reef tanks. There is friction glass to glass in the hydrometer tube as well as water creep on the probe, and the same water "creep" on my floating tank probe. In the tank I can look at it from below the water line and above and interpret two different readings.
In the salt tank I cured this issue with a Refractometer. For the batteries I just bought a HydroVolt and used it on my T-145's over the weekend. It tracks my glass tube hydrometer exactly without the tapping of bubbles and rattling around to zero out the glass on glass friction with a repeatable reading. It's simply a better mouse trap and no glass to break. Read the full .PDF sheet on it.
I will look into the HydroVolt. My only concern would be that the design looks somewhat similar to the EZRed that I had before. Mex tested a whole box of those and got readings all over the place. However, if the HydroVolt is very accurate, that may be the way to go.
