A sounding rod can refer to two different things:
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A rod or piece of iron used to ascertain the depth of water in a ships hold. It is let down in a groove by a pump.
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A probe used in urethral sounding, which is a sexual practice that involves inserting a long, thin rod, typically made of surgical steel, into the urethral opening. This type of sounding rod is also referred to as a sex toy consisting of a metal or plastic rod, generally with a ball at the end, generally inserted into a man's urethra but may also be made for women.
