The term is an allusion on military nomenclature: Mark I, Mark VIII, etc.
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Athlete's foot can usually be diagnosed by visual inspection of the skin, but if the diagnosis is uncertain, direct microscopy of a potassium hydroxide preparation of a skin scraping (known as a KOH test) can confirm the diagnosis of Athlete's foot and help rule out other possible causes, such as candidiasis, pitted keratolysis, erythrasma, contact dermatitis, eczema, or psoriasis.
Inspection of components and joint quality, using simple visual inspection, X-Ray inspection (usually of invisible joints, e.g. BGA), and/or automated optical inspection