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Coolant & Battery Refractometer
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Coolant & Battery Refractometer (NBH135)
It's time to toss your hydrometer. Unless you have a $60 laboratory hydrometer and are ready to run the temperature correction calculations, you are not getting an accurate reading. NAPA’s refractometer provides higher accuracy and versatility than a hydrometer, plus it can test ethylene and propylene glycol-based antifreeze in addition to battery electrolyte.
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