YSI, a xylem brand, includes UltraClean ultrasonic cleaning technology in its portable, optical-based turbidity, TSS, and UV/VIS sensors designed to measure accurately in harsh applications. The technology prevents biofouling by generating high-frequency vibrations of the optical windows. The result is improved data, reduced maintenance, and time saved. UltraClean keeps sensors clean even after a 30-day deployment. 937/767-7241; www.ysi.com; Booth #1041.