Do any of you recognize this product? Size Medium...gloves maybe? Tubing? For a Europol investigation.

French catheter scale

The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charrière, its inventor).

The French size is three times the diameter in millimeters. A round catheter of 1 French has an external diameter of  1⁄3 mm, and therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3:

D (mm) = Fr / 3

or

Fr = D (mm) * 3

For example, if the French size is 9, the diameter is 9/3 = 3.0; mm.

From the basic math equation C = πd, it follows that the catheter's circumference in mm is only slightly (about 4.7%) greater than the French size.


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