Why I abuse batteries was: trojan battery cycle [RE-wrenches]

[Jim Duncan]

A couple of years ago, I replied to this question about accurate battery 
testing with a suggestion that the Duo Chek optical battery tester was 
well worth it's $100 price tag. I was chided for spending such an 
extravagent amount for a tool when a cheaper one would work. (And how 
many Klein tools are in your toolbag?)
Mine is around 15 years old (I got it when it was 5) and it has been 
dropped hard several times. Don't try that with your glass tube type 
testers.
Anyway, the cheaper ones don't work accurately unless you do the 
temperature calcs and are sure that the floating balls are not just 
stuck to the inside of the tube because it wasn't cleaned completely 
last time. The Duo chek is temp compensated. 
It's not digital and it's not $100 any more but it's worth every dime.
I promise I'm not smirking...
http://www.kerncoinstr.com/11j14.htm

Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas
www.ntrei.com

Travis Creswell wrote:
 
I assume we would all agree what Specific gravity is about the most 
accurate to way to determine state of charge.
So here is possibly dumb question that I've wondered about for years.
Is there such a thing as digital specific gravity meter?  


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