The FC80 free chlorine sensor from Electro-Chemical Devices eliminates the need for reagents while providing accurate free chlorine measurement performance for applications in municipal drinking water and various industrial water treatment processes. The sensor monitors free chlorine in municipal drinking water from 0.05 to 20 ppm chlorine as the standard range, or 0.01 to 5.00 ppm with the low-range sensor. It is compliant with EPA Method 334.0 for measuring drinking water, includes digital communication capabilities, and operates over a temperature range from 32 to 122 degrees F. 800-729-1333; www.ecdi.com