Actually, electronic/computer based testing equipment is a fairly new tool(within 20 years) to the scrap world. There used to be NO testeing equipment at all. Items were identified by shape or original use. Different acids were used on metals to help identify them by the color of the chemical reaction, if any. Other metals were "sparked" with a grinder...the color and shape of the sparks were used to determine the alloy.
These guys are far from being "Morons"