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Philip M:The body of the unit is 2 inches, the connector section 1 inch for a total length of 3 inches. I did not keep the item connected as it was backlit and I thought it would draw power over time. So I do not know if it absolutely waterproof. There is no direct way to mount it except that the tender cord attaches firmly and you can put a velcro on the back to hold it. I just use it to check once a month or so. Really do not need to do that since I have a Shorai Lithium Battery.Dec 29, 2013
LAURENCE E:Overall length is 3". The meter part is 1 1/16" wide. Not back-lit. No claims for waterproof. Clearly intended as a diagnostic tool, not a mounted gauge. Pkg states "Not for use on Lithium batteries"Dec 29, 2013