These pumps gives users options. The unique mode selector means that you only need one model for both high-throughput and high-vacuum applications. In addition to the mode selector, these pumps have a two-position gas ballast. The pumps are fast-acting and able to work with large amounts of vapor. These pumps are perfect for industrial use, chemical applications, sample preparation, mass spectrometry, electron microscopy, research & development, and high energy physics.