RS Pro Foot Potentiometer. RS Pro Light Industrial Foot Potentiometer is designed to be economic to reduce operator fatigue and versatile for use in varied applications. With an average life expectancy of 1000000 cycles this foot potentiometer is ideal for use in environments where repetitive use is necessary. The potentiometer provides a variable voltage output proportional to the position of the pedal.. Features and Benefits. Utilises a solid state optical sensor to increase life span and reduce maintenance costs Potentiometer function through variable voltage output proportional to position of the pedal