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"Cold-Chek" Pocket Size Anti-Freeze/Coolant Tester For use on automotive, recreational vehicles and boats. Tests freeze protection of propylene glycol-based antifreeze to -50 degrees F. Balls will float to show freeze protection. Temperature compensating for accurate readings at any temperature, hot or cold. Easy and fast to use and read. Pocket protector shows temperature protection scale. Break-resistant tube.
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