Anti-freeze tester Material:glass tube,bubber, pp pipe Size:6" Fast and accurate testing of min freezing ... 3.Instruction of use:First to install the tester carefully,let the big head glass tube ... the bottom.Hold the tester vertically,put the rubber tail into the testing liquid,squeeze the ball ... temperature to freeze.4.Note:The tester is suitable for testing both methanol and ethylene glycol. Not ...