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As most of you know, I am off grid so have big traction batteries, biggest problem I have had for a long time is/was getting proper readings with hydrometers, I have tried many different types but getting consistent readings was always a real pain, so two days ago received a Refractometer to do the job and it is brilliant, no need to worry about temperature and doing calculations, this does it all and so easy, my job maintaining my power supply has been made so much easier, Oh and it does antifreeze as well as Addblue, Rick