Review on Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer by Shane Solorzano
Seems to work for my opinion
I first checked the zero with distilled water and it showed to be right on zero. Then I mixed a 50-50 mixture of coolant with distilled water and tested that. It showed 52%. Close enough.
- The best tool to use for today's newer coolants. No guess work as to the water ratio.
- May require additional tools for use
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