This is a tester that can measure the voltage and RPM of a motor. - Model: 7mini - Brand: SHINE TECHNICA - Function: Motor Tester Thank you for viewing. *As a bonus, a motor holder (used for break-in) will be included. *Manual not included. Recommended for those who understand the overview and operation. *The rotation sensor works. *The measurement bush for attaching to the motor shaft to measure the RPM has been lost. You will need to make your own.