sounding pole

sounding pole

[′sau̇nd·iŋ ‚pōl]
(engineering)
A pole or rod used for sounding in shallow water, and usually marked to indicate various depths.
References in periodicals archive ?
Sounding poles apart in terms of depth, attitude and aesthetics, Campbell's light whimsical sweetness softens Lanegan's dark and gravely croon and provides a place of safety and comfort as you're drawn into Lanegan's foreboding tales of love, death and woe.