Thumbwheel Potentiometers are in stock at Tenco Electronics. A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.Thumbwheel potentiometers are really handy when you don't have space on your enclosure for a knob and you still need access to a tuning or volume control.Tenco offers inventory, pricing, & datasheets for Thumbwheel Potentiometers. To know more, please view our large section of Thumbwheel Potentiometers below.