It will help you start in your experiments with Analog (ADC) on Arduino or any Microcontroller  pic stm avr atmel ,

 a variable resistor of 10KOhm. The potentiometer can be rotated up to 300 degrees to provide a variable voltage that your microcontroller can read using an analog input

Specification:

Resistance: 10KΩ
Power rating: 200mW (0.2W)
Voltage: 200V
Tolerance: 20%
Base diameter: 16.5mm
Base depth: 8.5mm
Shaft diameter: 6mm
Shaft length: 16mm (with thread)
Pith: 5mm (through hole or solder)

Package included:

1 x 10K Potentiometers