Chirp SB-216S

The EdgeTech 3100 is a portable (76kg) Sub-bottom Profiler used to visualize features down to c. 80m (clay) sub-bottom in up to 300m water depth. The SB-216S towfish operates at 2-16 kHz and can be used from smaller boats.

https://www.edgetech.com/products/sub-bottom-profiling/3100-portable-sub-bottom-profiler/#productTab4