... , Laser, Transistor,Trimmer potentiometers, FET(module), inductors, Fixed resistors, Swith, Crystal, Potentiometers and so on,which are widely used in high ... demonstrate the quality problem is a must. 4. Please make sure to conduct a test on the parts before mounted on board. Seller will ... should be returned within the guarantee period. NO return is accepted beyond the guarantee.6. Any items must be ...