A trimmer potentiometer, also known as a trim pot, is a small variable resistor that is used to adjust the resistance of a circuit. It is typically a three-terminal device with a sliding or rotating contact that allows you to adjust the resistance between the two end terminals. The 100K trimmer potentiometer, also known as a W104 potentiometer, is a specific type of trim pot that has a resistance value of 100,000 ohms (100K). It is often used to adjust the sensitivity or calibration of a circuit, or to provide fine adjustments to a system's operating parameters. Trimmer potentiometers are commonly used in a wide range of electronic applications, including audio equipment, instrumentation, and control systems. They are available in a variety of sizes and shapes, and may be adjusted using a screwdriver, a small tool, or by hand.

This small trimpot potentiometer is used to calibtrate circuits by adjusting the value of resistance in the circuit. Trimmer potentiometers require a screwdriver to change the value of resistance and are not indended to by adjusted often such as by the user of the device. Once you have set your resistance value then you will generally leave the trimmer potentiometer at that value indefinitely.