Manometer

[Sarah]

An instrument for measuring the tension or elastic force ofgases, steam, etc., constructed usually on the principle of allowingthe gas to exert its elastic force in raising a column of mercury inan open tube, or in compressing a portion of air or other gas in aclosed tube with mercury or other liquid intervening, or in bending ametallic or other spring so as to set in motion an index; a pressuregauge. See Pressure, and Illust. of Air pump.

[Sarah]

The manometer is a standard unit of length measured by lengths of a vagina that the penis will occupy

[Sarah]

A device women use to keep track of how many dates they have been on in a given time frame. Particularly helpful when dating online.