The Halmi Nozzle from Primary Flow Signal has a battery-powered digital flow monitor for remote or hard-to-reach installations. It is designed for open-conduit flow for water, sewage, sludge or any other nonpressurized material. It measures liquid flow in horizontally laid pipes where the flow partially fills the pipe and is driven by gravity only. It is powered by standard AA/LR6 batteries and can operate in environments between 14 and 122 degrees F. It has an accuracy of plus or minus 2.0 percent and can be used with secondary readout devices, including ultrasonic level capacitance, pressure and a local staff gauge. 401/461-6366; www.primaryflowsignal.com.