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Cold-Chekr-Charg-Chekr Refractometer Requires just one drop to measure refractive index of solutionvTests anti-freeze (EG/PG) protection and battery electrolyte (state of charge). Features Fahrenheit and Centigrade scales for anti-freeze plus a scale showing degree of battery charge. Has calibration adjustment and adjustable focus. Includes small screwdriver, eye dropper and padded case.
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