The Q46N Free Ammonia Monitor from Analytical Technology is designed for the continuous measurement of free ammonia, total ammonia and monochloramine in potable water. It is intended for monitoring chloraminated water to minimize the amount of excess ammonia in the system. It has a fast response time for real-time ammonia measurement, providing continuous, real-time updates for better process control. It uses a simple chemical system with three reagents required for operation that can be purchased directly from the company or easily mixed on site using readily available chemicals. It comes with replacement parts for routine maintenance, a monitor, chemistry module, sensor membranes and electrolyte, reagent bottle brackets, reagent pickup tubing assemblies, and a copy of the manual packed inside the chemistry module. 800/959-0299; www.analyticaltechnology.com.