Anti-freeze tester Material:glass tube,bubber, pp pipe Size:6" Fast ... :8"3.Instruction of use:First to install the tester carefully,let the big head glass tube which has ... fit the rubber tail at the bottom.Hold the tester vertically,put the rubber tail into the testing liquid, ... is equivalence with the surface of liquid indicate the lowest temperature to freeze.4.Note:The tester is suitable for testing ...