The DLT 2.0 from Greyline Instruments can measure differential level at a bar screen, plus open channel flow through a flume. It works with two noncontacting ultrasonic sensors. One sensor is installed upstream from the bar screen, with a second sensor downstream for differential level control. The second sensor can also be installed in a flume to control and transmit differential level control plus flow. The unit includes relays for bar screen rake and level control, as well as three 4-20mA outputs (upstream level, differential level, downstream level or flow). The large backlit LCD display shows level, differential level, flow and total flow. Intrinsically safe sensors and data logger are optional. 888/473-9546; www.greyline.com.