Selecting the right leak detector for a particular application can be confusing. Although there are many leak detection technologies, when the leak rate requirement is between 10-6 and 10-10 atm.cc/sec (cubic centimeters of gas per second at a pressure differential of one standard atmosphere), tracer gas methods are the only technologies that deliver accurate and repeatable results. Furthermore, if the leak rate is between 10-6 and 10-10 atm.cc/sec, helium leak detection is the only option.