Browse antifreeze test strips for your heating and cooling system at F.W. Webb. A test strip is an important instrument for measuring the concentration of coolant and pH levels in your HVAC system. The strips are used in residential, commercial, automotive, and other industries that require antifreeze or anti-boil coolants. Test your systems regularly with a convenient strip and determine if they need servicing. Early detection helps keep systems running properly. Find high-quality and reliable test strips for your heating and cooling system when you explore the options at F.W. Webb.