Cool-Trak 311519 Coolant Testing Strips - Set of 50 Quick and effective way to prevent coolant system damage Measures coolant freeze point, boil point and pH levels of 6, 7, 7.5, 8 and 11. Test works with both ethylene and propylene glycol-based coolants Detects acid build-up which can cause leaks and damage to engine cooling components Cannot be used on orange or red fluids