Quote:
Originally Posted by FW28z
... You can buy one of those Antifreeze Refractometers and test the water as you purge the lines to see how much antifreeze is left in the lines. You can buy them on Amazon for as little as $25, all the way up to $150.
Get one that can measure Propylene Glycol (the pink RV stuff). Many of these refractometers will measure both Propylene Glycol, Ethylene Glycol (the normal green engine antifreeze), battery and brake fluid.
Like this one:
Antifreeze/battery Refractometer Rha-200atc with Automatic Temperature Compensation - Multi Testers - Amazon.com
... Anyway, seems yet another handy tool RV'ers should have.
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The one you listed also measures battery fluids. In my automotive days we used them to determine the strength of battery acid in lead acid batteries. A low reading was an indication a battery was ready to go belly up and not worth the time to try charging. They kind of lost favor with "maintenance free" batteries but seem to be making a comeback now.