... :calculator 13:drilling of circumference 14:drilling of oblique line 15:machining of inclined plane 16:machining of circular arc 17 ... digital readout is specialization design,elegant appearance ,high speed of numeation,multy function2,Aluminum ally ,spray plastic appearance , ... shield.3,independent power,widely used,high stabilization,capacity of resisting disturbance well4, the power source and the ...