You can keep it around your wrist, clip it off on a BCD or slip them in a
Solid aluminum dive stick pointer, corrosion-resistant, durable, lightweight and portable
With 1-15cm graduation, accurate to millimeter under the water easily
You can use it to get the lobsters out of the holes or touch unknown underwater creatures, safer and more environmentally friendly
Also can be used to indicate the direction or make sounds to indicate someone else to pay attention to something