The Kent-Moore J-39400 R12 & R134A A/C Leak Detector is a high-quality hand tool designed specifically for detecting refrigerant leaks in automotive air conditioning systems. Manufactured by Kent-Moore, a trusted brand in the automotive industry, this leak detector (with manufacturer part number J-39400) is reliable and efficient for pinpointing leaks quickly and accurately. Perfect for mechanics and auto enthusiasts looking to diagnose and repair issues with their vehicle’s cooling system.