Ah the joys of units! If you work cross-discipline, 1/1000th of an inch is called a 'thou' in machining. For PCBs (not unheard of to attach the two together), t

Ah the joys of units! If you work cross-discipline, 1/1000th of an inch is called a 'thou' in machining. For PCBs (not unheard of to attach the two together), the same unit is called a 'mil'. Not to be confused with millimeter, even though it often is confused.