Porter Instrument's passion for precision is a legacy dating from our founder's invention of a tube-forming machine utilizing a heat/vacuum process, capable of precisely sizing the internal dimensions and configuration of glass tubing within 50 millionths of an inch. This invention led to the first production of interchangeable, glass rotameter tubes. Today, in that same tradition of precision, Porter Instrument flow and pressure control instruments, both standard or modified to customer design requirements, excel in some of the world's most performance-critical applications. They play a vital role in the production of computer chips. They are trusted for the regulation and measurement of anesthetic gases in operating rooms worldwide. They aid in the production of pharmaceutical drugs, cutting-edge biotech research, dental patient sedation and environmental monitoring.