Many of us just leave coolant/antifreeze checks to the garage, but it is easy to test and top up yourself at home, and it can save you time and money. The Prestone Coolant/Antifreeze tester is quick and easy to use and is guaranteed for use with all vehicles, so you can check whether your car is protected any time. It tests your winter protection down to -37ºC, and your summer protection up to 129ºC to ensure you’re prepared for extremes