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Jul 2, 2019 at 16:24 vote accept jackrabb1t
Jul 2, 2019 at 13:54 comment added mongo A refractometer tester will last you the longest, and give the most repeatable results. About $20 from places like ebay.
Jul 2, 2019 at 13:18 history edited Solar Mike CC BY-SA 4.0
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Jul 2, 2019 at 13:16 comment added GdD You can buy a coolant tester as well if you want to do it yourself.
Jul 2, 2019 at 13:01 history answered Solar Mike CC BY-SA 4.0