The quality of fuel hydrogen significantly affects the performance and lifespan of fuel cell engines. During the use of hydrogen, it is essential to sample and test the hydrogen to ensure that the fuel hydrogen meets the usage standards for fuel cell engines. The portable gas hydrogen samplers are available in two types: 35Mpa and 70Mpa, and they sample directly from the hydrogen refueling port of the hydrogen refueling machine. The sampling is safe, reliable, and representative.