If you're looking for a time-saving way to find Freon leaks, try Leak-Tec 372E leak detecting fluid. This is an easy and inexpensive way to detect leaks, as it uses film bubble testing. There's no instruments to break down, and it works immediately. It's also very sensitive to small leaks. Don't use soap and water - Leak-Tec 372E is far more effective!
Requires little operator training
Inexpensive and easy; no complex instruments that can break down
Works right away and continues to show leaks
Extremely sensitive; finds leaks down to .000001 standard cc/second equivalent to losing a pound of Freon every 2,700 years