Antifreeze Testers - Accuracy

91audi06

Group: 19

Number: 91-02

Date: 10/31/91


Subject: Accuracy of Antifreeze Testers


Model(s): All All M.Y.


Float type antifreeze testers, with age, may read incorrectly. Antifreeze and corrosion inhibiting additives stick to the float making it heavier, causing inaccurate protection level readings.

Calibrate your tester using a 50/50 mixture of antifreeze and water. It must read -34~ F. If your tester is not accurate, put a mark (or paint dot) to indicate the location of -34~ F.

With this information you will be able to continue using your tester and make accurate antifreeze protection level test.





Graph shows the freezing points of various antifreeze/water concentrations.