Refractometers [RE-wrenches]

[Nick Houser]

I'd like to second Jim in praise of the "Misco" brand of 
refractometers for testing battery (Non-sealed) state of 
charge. Mine is a model 7084 F, which was a much-appreciated gift 
from a happy customer; Iv'e been using it for years to calibrate the 
plastic hydrometers I give all my battery customer. This particular 
customer was retired from Finning, where they don't use 
anything else. Also good for testing glycol concentration, it's best
feature is that it only needs a few drops of electrolyte to
give an accurate, temp-compensater reading. Pays for itself 
in workpants VERY quickly. Like my Fluke collection, it takes
the guesswork out of measurements. I've also used the somewhat 
less expensive automotive versions like the "Ultra-Pro 62240)
(Napa), but though they work, they just don't resolve nearly
as well. In this as in so many other things, there's really no 
substitute for the right tool. Although, if you really can't afford the 
Misco, the Napa one has the redeemong factor that it CAN
be calibrated, which is not possible (necessary) with the Misco.


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