Snap-on's Metered UV Dye Injector Gun with Hose Coupler and 12 Ounce Dye Cartridge, No. ACTUVPROKT, allows the user to add leak detection dye to an A/C system without the use of other equipment. The tool requires just one precise squeeze of trigger per application, which makes it more accurate than caulk-style guns. Each cartridge of dye covers 96 applications of 1/8 ounce of dye. The universal dye benefits from being safe for all air conditioning systems and comes SAE certified and OEM approved .