Use an antifreeze hydrometer. Suck in coolant from the header tank; if there is a float, take a reading where the float breaks the liquid surface and convert to antifreeze strength on the hydrometer chart. If there are balls, the numbers and colours floating show the strength;check the instructions.Click to see full answer. In this way, what is a antifreeze hydrometer?Accurately test the antifreeze in any vehicle with this antifreeze hydrometer. The hydrometer tests ethylene glycol on a temperature scale from -51°C to 0°C (-60°F to 32°F), indicating whether the solution is properly mixed to prevent freezing. how does a hydrometer work? A hydrometer is an instrument used to measure the specific gravity or relative density of liquids, i.e. the ratio of the density of the liquid to the density of water. The liquid to be tested is poured into a hydrometer cylinder and the hydrometer is gently lowered into the liquid until it floats freely. Also to know, what does an antifreeze tester do? Prestone Antifreeze/Coolant Tester is a professional do-it-yourself tester that easily tests for anti-freeze/anti-boil protection. Allows visual inspection for rust and sediment. This is a low-cost way to check the condition of the antifreeze/coolant in your vehicle.How accurate are antifreeze testers? Laser Ethylene Glycol Antifreeze Tester 4293 review We also found the results were similar, with poor accuracy for 33% concentration anti-freeze and readings around nine degrees off, but better results for 50% concentration.
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