WIX Filters - 24106 Coolant Test Kit, Pack of 1 WIX 24106 WIX Coolant Test Kit Principle Application: Coolant Test Strips for Standard Service (50 Count Bottle) - test for 3 things: nitrite level, freeze point, pH level - NOTE: test strips will not work for extended or long life antifreezes (only for traditional, standard antifreezes) Packaged Individually