Antifreeze/Coolant Testers
With Ball Floats
With Disc Floats
Floats visually indicate the level of freeze protection in coolant systems. Insert the tube into your coolant tank, squeeze the bulb to draw in coolant, and count the number of buoyant floats. The more buoyant floats, the higher the freeze protection.
Disc floats are larger than ball floats for increased visibility.