Phoenix Systems 8003-B Double-Ended Test Strip for Coolant + Brake Fluid (100 Test Strips and 100 Rating Scale Cards) The dual ended strip increases level of service, ensuring that every vehicle has both coolant and brake fluid tested Brake Strip provides a visual reference for brake fluid copper corrosion levels Coolant Strip effectively measures the pH level and glycol percent of engine coolant The double-ended strip provides easy to read visual proof for when you should or should Not change these vital fluids Comes with an additional 100 test strip cards for customer evaluation