Vacuum testing is utilized for finding smaller helium leaks. While the inside of the the part is pressurized with a helium/nitrogen mixture, the outside of the part is encapsulated in a vacuum tight chamber which is connected to the helium spectrometer. Accumulation testing utilizes a chamber as well, but the chamber is left at atmospheric pressure. As the helium leaks from the specimen, it accumulates in the chamber which is connected to the helium spectrometer through a micro flow control valve. Sniffing includes a test probe which is connected to the helium spectrometer through a micro flow control valve. The probe is physically moved around the test part seams or connections to 'sniff' for a leak. A robot or other automated motions are utilized for this movement to ensure repeatability and thoroughness. Safety concerns can include parts failing under high test pressures. Depending on the test method and type of part, a lexan guard can be lowered during every test cycle and raised for the operator to load and unload parts. Background helium can accumulate in the test area as a result of bad parts or mishaps. This can contribute to poor reliability of test results. To prevent this, as well as reduce recovery times, an overhead hood can blow fresh air onto the test tooling. In addition to this, the helium in the part is purged out of the building during every cycle.