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 ...
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Bet I can see tons of errors in all this using my 20X loupe. Chum Lee is IMHO most correct. If a .00000001 gravity resolution is necessary it's a horse of another color.
Look, if you are after ultra precise resolution, Freas, sells an EXPANDED SCALE hydrometer. Use it with reading glasses and whatever parallax is seen in the meniscus will be insignificant.
Take an exact 10 ml extraction and place it on a .01 digital gram scale. There are precision measures that positively cannot accept 10.01 ml. Adjust for temperature and there you are: Mother Fletcher's Do It Yourself Specific Gravity Laboratory.
While you're playing Professor Zharkoff, keep in mind small but significant stratification variances within the cell.
Look, if you are after ultra precise resolution, Freas, sells an EXPANDED SCALE hydrometer. Use it with reading glasses and whatever parallax is seen in the meniscus will be insignificant.
Take an exact 10 ml extraction and place it on a .01 digital gram scale. There are precision measures that positively cannot accept 10.01 ml. Adjust for temperature and there you are: Mother Fletcher's Do It Yourself Specific Gravity Laboratory.
While you're playing Professor Zharkoff, keep in mind small but significant stratification variances within the cell.
