Aquionics’ PearlSense T254, the first transmittance monitor to use UV-LED technology, provides UV disinfection system manufacturers and operators with highly accurate UV transmittance (UVT) readings in all conditions over an extended lifetime, ensuring proper UV dosing and efficient operation. It features a patent-pending fixed-position single lamp and sensor design with an automatic two-point reference check. A UV-LED light source allows instant activation and highly efficient, mercury-free operation. The monitor is capable of battery and solar-powered operation, and can be used in a variety of configurations including handheld operation, installed directly in a pipe or bracket-mounted in an open-channel environment. http://www.aquionics.com, (800) 925-0440