Long before innovations in semiconductor processing made the production of integrated circuit (IC) sensors and MEM sensors possible, industrial sensors were used to sense, detect and measure changes in the position, displacement, temperature, pressure, electrical current, and many other parameters of manufacturing processes and industrial equipment. But unlike the tiny form factor sensors used today on PCBs in smart phones or Internet of Things (IoT) devices, industrial sensors come in a much wider variety of sizes, shapes and technologies. Some are PCB-mounted ICs, while others are system level components integrated into a piece of machinery or an entire manufacturing production line. A familiarity of industrial sensors is useful to any engineer, whether he or she is just beginning their career, or are further along and desire to broaden their body of knowledge.