Analytical Technology Inc., of Oaks, Pa., has released a new particle monitoring system designed to provide highly sensitive filter effluent measurement for potable water systems. The C10/77 Sensor is a laser-based system that counts and displays particles at 2, 3, 5, 7, 10, 15, 20 and 200 microns in size. An LED display on the front of the counter allows operators to view the current counts at any size, and also to display differential counts for adjacent size channels.