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Q:Is this for Ethylene Glycol or Propylene Glycol?
A:This part Thexton Cold-Chek Disc-Type Anti-Freeze Tester, Part No. THX106 disc-type 16 1/4” tester is accurate at all temperatures. Tests ethylene glycol based coolant, hot or cold, including Dex-Cool®. Easy to read discs are magnified by convex design of the clear SAN plastic barrel. Celsius and Fahrenheit scales. Special feature is the “6th disc” which shows overprotection and a loss of cooling efficiency. Beyond 70% anti-freeze, cooling & corrosion effectiveness is reduced. One-piece bulb and neoprene dip tube.