A device used to measure the freezing point of engine coolant typically employs a series of weighted balls within a transparent tube. The specific gravity of the coolant is assessed by observing how many of the balls float; a higher specific gravity indicates a lower freezing point. A graduated reference guide, often printed on the device itself, correlates the number of floating balls to a temperature reading, providing a quick visual assessment of the coolant’s protection level. For instance, if all balls float, the coolant is likely providing protection down to a very low temperature, whereas if only one or two float, the protection is significantly diminished.
This method offers a simple and relatively inexpensive way to determine if the coolant requires replacement or dilution. Regular testing ensures the cooling system is protected from freezing, which can cause significant engine damage. The approach has been utilized for many years due to its ease of use and portability, making it a common tool for both professional mechanics and vehicle owners for maintaining their vehicle.
