1. Outer appearance quality: It should be bright and smooth

2. Axial flee of input shaft: <0.5mm

3. Axial flee of output shaft: <0.5mm

4. Output shaft starting moment: <0.45N.m

5. Impact force resistant experiment: It should not have cracks after the impact test

6. Noise test: The noise should be less than or equal to 50dB

7. Life test: 5000 time Conformity