Trimmers are potentiometers which need infrequent adjustment and they are often used to calibrate a device or circuit after manufacturing. They require a special tool for adjustment. Rheostats are two-terminal variable resistors which function similarly to a potentiometer. A three-terminal potentiometer can be used as a rheostat with the third terminal left unconnected, and is typically used as a strict variable resistor.
Trimmers Products under Variable Resistors

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