The OCF 5.0 open-channel flow monitor from Greyline Instruments uses a non-contacting ultrasonic sensor to measure wastewater flow through flumes or weirs. It has a built-in data logger with on-screen flow reports and output to USB flash drives, plus Windows software to display and graph flow reports in fully customizable formats. It works with a non-contacting ultrasonic sensor mounted above the flume or weir. It includes isolated 4-20 mA and USB outputs; two programmable relays; and a large, backlit LCD flow-rate display and totalizer. Calibration and selection of flume or weir are made through a built-in, five-button keypad and user-friendly menu system. The calibration setup is password protected, and flow data and totals are safely stored through power interruptions. Temperature compensation is automatic and accuracy is plus or minus 0.25 percent. 888/473-9546; www.greyline.com.