The Sensor Technology SQ26-01 hydrophone is a reliable, low cost, rugged hydrophone which is integrated into instrumentation.
The SQ26-01 hydrophone is commonly used in towed arrays, AUVs, and autonomous recorders. This hydrophone is very popular with student AUV competition teams. It is designed to solder onto an ROV board and therefore It is only meant for ROV usage as it has a 10cm lead and no preamplifier.
The usable response (+3/-12dB) is good to better than 50kHz. The official "Flat" frequency response (±1dB) is rated to 28kHz. See the frequency response plots and the beam pattern plots (click on any thumbnail for enlargements).
Although the SQ26-01 hydrophone is low cost, it is a professional hydrophone and is not recommended for novice users.
The SQ26-01 hydrophone has a 2000m depth rating and is, therefore, subject to export restrictions.
