About

TSI Incorporated, originally named Pentalent Engineering Company, is a Minnesota-based firm specializing in the design and manufacturing of various measurement instruments. The company's products range from wind speed velocity sensors, used by NASA, to the PortaCount Respirator Fit Tester, a highly successful product utilized by the U.S. Army and Marines. TSI's extensive portfolio also includes Aerodynamic Particle Sizer instruments, which detect airborne biohazard materials. Over the years, TSI has expanded its operations through numerous acquisitions, including companies like Handar, Alnor Instrument Company, and MSP Corporation, among others.

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