Firstmark Controls provides superior quality string position transducers for testing and OEM applications. With a proven legacy in the aviation, automotive, medical, space and general industry sectors, our rugged products have been serving the demanding needs of our customers since the 1970s. Beyond providing the most customizable product offering on the market, Firstmark's off-the-shelf aerospace grade transducers (15x, 16x and 17x) are all DO-160 rated and ready to be implemented in even the harshest conditions.