William,
Why bother, when a refractometer is cheaper, does a better job, self-corrects for temperature, and won't be broken when you pull it off of your truck?
Here's an example, quickly found on eBay, if you're not familiar with these: http://www.ebay.com/itm/Robinair-75240-Coolant-and-Battery-Refractometer-/131591979786?hash=item1ea37e430a&item=131591979786&vxp=mtr
This has come up before on this list.
Allan

Allan Sindelar
[email protected]
NABCEP Certified PV Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
505 780-2738 cell

 

On 8/30/2015 5:08 PM, William Miller wrote:

Friends:

 

We are maintaining more vented battery systems.  I am contemplating purchase of a digital hydrometer.  Does anyone have any experience with one of these?

 

Thanks in advance,

 

William Miller

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