The FX-CL series microprocessor-based amperometric residual analyzer from Foxcroft Equipment & Service Co. simplifies online chlorine residual monitoring and control. Electrode options include direct bare electrode for free or total chlorine, and reagentless membrane-covered sensors for free and total chlorine, chlorine dioxide and ozone. Users can calibrate and program settings with a 4.3-inch LCD full-color touch screen. The device has configurable high and low alarm levels, flow alarm, fault alarm, auto temperature measurement and compensation. It can handle up to four current outputs, up to eight relay outputs and an RS485 serial port. 800/874-0590; www.foxcroft.com.