The Pipeline Model PSA-AV sensor from FloWav combines pressure depth technology and continuous wave Doppler velocity technologies with sensor level signal processing, providing results within the range of plus-or-minus 2 percent of flow. It employs progressive spectral analyzer technology that increases the accuracy of the velocity reading, and reduces power consumption, all controlled by a small-diameter cable. It utilizes a piezoresistive ceramic sensor, which allows it to maintain accurate and reliable depth readings in hostile and corrosive sewer environments. 855/235-6928; www.flowav.com.