Fahrenheit Refractometer Antifreeze Tester
High-precision optical lens ensures accurate freezing point measurement for auto battery fluid, glycol, and coolant. Durable aluminum alloy body with scratch-resistant coating for long-term reliability. Wide-scale Fahrenheit readings (-50°F to 34°F) cover all common antifreeze solutions. Automatic temperature compensation (ATC) eliminates manual adjustments for consistent results. Compact 4-in-1 design tests coolant concentration, battery fluid health, and winter readiness. Ideal for mechanics, auto shops, and fleet maintenance professionals. Includes calibration screwdriver and protective case for easy storage and field use. No batteries required—works instantly with just a few drops of fluid.