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
