Refrigerant leaks are the number one cause of poor A/C cooling. Having the correct amount of refrigerant in an A/C system is critical to achieve proper cooling. Any loss of refrigerant will reduce a system’s ability to transfer heat, causing the compressor to work harder and the system to cool less efficiently. Therefore, using a UV refrigerant leak detection kit to find and fix leaks is more important than ever before. The Tech-Set™ UV55 leak detection kit enables you to conduct a fast, easy, mess-free air conditioning "leakdown" test whereby an orange, universal dye is injected into a closed (sealed) A/C system under full pressure. The UV dye leak detection kit uses orange dye that will be visible under a "correctly tuned" ultraviolet light at the point of a leak anywhere in the system.