"Nortek Signature1000 Acoustic Doppler Current Profiler"@en . . "SDN:L22::TOOL1009" . "An Acoustic Doppler Current Profiler (ADCP) for use in turbulence studies. It consists of five acoustic transducers, four slanted at 25 degrees from vertical, and a fifth vertical beam. All beams operate at the same frequency of 1 MHz. The instrument has integrated pressure and temperature sensors."@en . .