Gauge rod

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a graduated rod, for measuring the capacity of barrels, casks, etc.

See also: Gauge

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Sheriff's officials say McCullum caused the lockdown when he was observed on camera disassembling the "water push button" from his sink and removed a 12-inch steel gauge rod that he then intended to use as a "shank" to settle a dispute he was having with another inmate.
During all of these procedures, the evenness of interior and exterior areas was consistently checked with a gauge rod, defective areas were removed and installed again.
The unique look and feel of Tibetan rugs is the result of a handweaving technique in which the yarn is knotted around a gauge rod, row by row.