Protean Instrument is a leading manufacturer of ultrahigh performance counting systems for measuring alpha/beta activity at very low environmental levels. The company was founded in 1989 by people who were the principal designers and manufacturers of the classic "dual-rail" alpha/beta and smear counting systems. Their design and manufacturing expertise is evident in the number of these classic systems still operating today.

Protean currently offers a very complete line of instruments. The current range of instruments emphasizes two uncompromising design factors that are focused on delivering the highest possible performance and the easiest maintenance in the industry.