A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to digital output signals. Rotary encoders are used in a wide range of applications that require monitoring or control, or both, of mechanical systems, including industrial controls, robotics, photographic lenses, computer input devices such as optomechanical mice and trackballs, controlled stress rheometers, and rotating radar platforms.Specifications:Model: WH138Resistance: 5KΩType: Single Linear Rotary PotentiometerMaterial: metal and carbon filmAdjustment method: 300°±10° RotaryPins: 5Length of Shaft: 15mm/ 0.59inchResistance tolerance: ±20%Temperature range: -10°C - 85°CInsulation resistance: More than 100MΩWithstand voltage: 1 minute AC 250VRotation life :10000 revolutionsPackage Content:5PCS WH138 Rotary Potentiometer5PCS Black Knob Cap