Helium leak detection equipment that uses helium gas as a tracer gas to detect extremely fine leaks with high precision. Includes helium leak detectors with built-in mass spectrometers, leak detectors integrated with vacuum pumps, and portable helium detectors. Used for airtightness testing of automotive engine parts, air conditioning piping, semiconductor manufacturing equipment, and medical device housings, capable of detecting fine leaks down to 10^-12 Pa·m³/s level. Unlike pressure decay or bubble testing methods, features high-sensitivity detection through mass spectrometry specific to helium gas, and is specialized measuring equipment compatible with both vacuum leak testing and pressurized leak testing.