The MULTI-PURPOSE Refractometer and Test Strip Kitby Acustrip is designed to meet service providers’ diagnostic needs through test strips that evaluate antifreeze coolant, brake fluids, DEF, water, and power steering protection capacity against corrosion, in addition to the refractometer measurement of the concentration of antifreeze, DEF, windshield washer fluid, and battery acids. Larger Kits are also available. Get free samples of the test strips at Acustrip.com/challenge.