How to Use a Refractometer

[@grumpy1962R]

I love this! Why are the comments turned off on all your other videos? We all have questions and you have the best videos out there on this stuff!

[@no-damn-alias]

can't I just use the voltage of the battery to tell me the state of charge?

[@wesleypowers]

Good question...

[@CanadaRobertW]

No