Charriere, Charriere Gauge (Ch)
Charriere, Charriere Gauge (Ch) :
A unit of distance used for measuring the diameters of small tubes such as catheters, fiber optic bundles, etc. The gauge number is the diameter of the tube in units of 1/3 millimeter. In English-speaking countries, the scale is usually called the French gauge and the unit is simply called "French." Charriére was a nineteenth century French instrument manufacturer
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