Any instrument used to measure or quantify, typically used to measure tank pressure, depth and direction in diving. Hose: Used to carry air in a SCUBA unit. Example of use : connects the Ist stage to the second stage of a regulator. J valve: a valve with a spring loaded mechanism that allows a reserve of air in the tank that can be actuated by pulling a lever secured to the valve. K valve: the standard valve in use today. Both J and K valves are yoke valves, which refers to their attachment method. Log book: a record of one's dives, including details of the dive. Required by some operators as proof of experience

Sometimes referred to as “cut”, it's the number of stitches per 1/2 inch in full fashioned sweater machines, and the number of needles per inch in other machines

A standard designation of wire sizes. The larger the guage number, the smaller the wire.

Used to differentiate between various thicknesses of wire used in sports timing. The higher the number, the thinner the wire. Common phone wire used for sports timing is usually 18 or 22 guage.

the distance between running edges or inner faces of the rails of railway track.