The PearlSense T254 from Aquionics is the world’s first and smallest, UV LED transmittance monitor. The product’s unique patent-pending design utilizes a single lamp and sensor, eliminating drift seen in other product designs using multiple lamps and sensors. It provides users with a low operating cost, ultra-long lamp life with virtually zero warm-up time and a tiny installation footprint. The product also offers an eco-friendly, mercury-free operation that can be used in a variety of configurations.