Spine scoliometer.
Previously:
Bubble level - video
Shark with scoliosis - GIF
Spine scoliometer.
Previously:
Bubble level - video
Shark with scoliosis - GIF
Looks identical to the sort of gauge I've seen used to measure roll angle on a ship...
https://www.amazon.com/Sun-Company-2.../dp/B00042K694
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