;Number Of Floating Discs Measures The Degree Of Coolant Protection, Tests Both Hot And Cold Coolant, Reads In Celsius And Fahrenheit;Used For All Vehicles;Disc;Antifreeze/Coolant Tester RestrictionsCalifornia Proposition 65 Warning: This product contains a chemical known to the State of California to cause cancer. Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Fluid TestersTest ethylene glycol solutions to determine the level of coolant/antifreeze protection. Floating discs or balls indicate the freeze point of a given solution.