Review on Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer by Michael Mayes

I don’t know much about how refractors works but I changed coolant on 2 of our vehicles myself and during the process I flushed many times first with distilled water. When I added concentrated coolant I was concerned about making sure I had correct protection for the engine. I tested quickly with this refractor and it indicated I had adequate mixture. I then would test it with only water and it would calibrate down to 32 degrees as freeze point. I’m hopeful this is accurate but it seems very nice!