1. visual id stack rusty with naked eye. if rusty area exceed 1 lam ,judement NG.
2. visual laser marking with naked eye. clearly visible and don't scratch.
3. visual insulator 2 with microscope. start at thermister, clockwise rotate. Don't have chip, M/W don't dent and scratch, Housing don't deform.
4. visual insulator 1 with microscope. start at edge of housing window on right hand, clockwise rotate. housing don't deform, don't dent and don't scratch.
5. visual od housing ้้้,half of od area on left side with microscope. start at edge of housing window near pin no.8, turn out of yourself. don't have dent, scratch, short mold and porosity.
6. same as no.5 but visual half of od area on right side.
7. visual housing leg with microscope. start at thermister, clockwise rotate. don't bend and don't have dent, scratch, burr and porosity.