Refrigerant is heavier than air, so it settles in the A/C system or engine compartment. Start detecting at a low point; a high concentration may not necessarily indicate a leak in that area. Move up as you trace lines. And be sure to check around fittings and connections, and on the underside of lines and components. In windy locations, shield the site to keep the wind from dissipating the refrigerants.

For all CFC, HCFC and HFC Refrigerants Including R12, R22, and R134a
The first thing you notice about our new electronic leak detector is the modern look. It's been ergonomically designed so it fits your hand. Holding it while you're searching for leaks is natural and comfortable, and you'll find it fits into tight spots so you can thoroughly check for leaks, For all it compact size, the ROB-16600 is packed with features that help you pinpoint leaks quickly.