Do the newer antifreezes need a different hygrometer than the ethylene glycol types?

 

If not, has anyone ever seen a hygrometer 'go bad'?

 

I have one that's a bit old, has a swinging needle indicator vs. a series of balls, and I can't tell if I got screwed on a coolant service or if the tester is reading wrong.

 

 

Dave

An ethylene glycol (EG) antifreeze hydrometers don't read correctly if at all on newer propylene glycol (PG) antifreeze. Best bet may be to pick up a new one. Also you may want to look into coolant test strips to test the ph if you are checking if its bad.