Antifreeze tester for testing Propylene Glycol. This is a disc type antifreeze tester allows coolant to be checked either hot or cold. By counting the number of discs that float the degree of protection can be read from the scale on the body of the tool. The large size of this tool makes it easy to read, and the plastic barrel is almost unbreakable in normal use. This particular tool tests all the new modern antifreezes (check with Manufacture to which antifreeze is used)