I was working on some glycol today and realized I didn't grab the refractometer from the shop. I ended up purchasing this little guy. For those that don't know, you drop some glycol on the lens to test its freeze point. They have scales for both ethylene and propylene. Hold it up to the light and look through the view finder. #teachme

Posted by HVAC Know It All at 2022-02-02 01:08:18 UTC