... capacitors, Beads, Optical couplers, Relay, Fuse,Diodes, Discharge, Quartz crystal Devices, Speaker, Buzzer, Optoelectronics/Fiber, Laser, Transistor,Trimmer potentiometers, FET ... sure to conduct a test on the parts before mounted on board. Seller will not take any responsibility for ... any parts which have been mounted in printed circuits board and then pulled out.5. ...