The Sultan 34 Dual noncontact acoustic wave transmitter from Hawk Measurement, Middleton, MA, is suited for use in level, flow, positioning, and collision protection and can measure two different applications at once. The unit emits high-powered acoustic wave transmit pulses from two transducers, which are reflected from the surface of the material being measured. The reflected signals are processed to enhance the correct signal and to reject noise or spurious echoes. The receiver circuitry is designed to identify and monitor low-level return signals even when noise levels are high. Measured signals are temperature compensated. Applications include wastewater/water, mining, power stations, food and beverage processing, irrigation, and quarries.