Avoid the anxiety of not knowing when your car's system is in need of a flush and fill, top off or cleaning. It is important to maintain your anti-freeze/coolant at the proper concentration to provide good corrosion protection as well as prevent freeze-ups and boil-overs. This tester provides a quick and easy method to safely collect a sample and measure coolant concentration. It also allows a visual inspection of the anti-freeze while you test it. This is a low-cost way to check the condition of the anti-freeze/coolant in your vehicle.