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The refractometer is a precision instrument which tests the freezing levels of Antifreeze and battery fluids and has an automatic temperature compensation facility. Contents: refractometer, precision screwdriver for the calibration screw. Tests the freezing levels of antifreeze and battery fluids. Automatic temperature compensation. Includes dropper for collecting fluid and plastic storage case. Also works on modern long-life antifreeze (OAT) and Propylene Glycol.