YYP127 coefficient ntawm kev sib txhuam tester yog ib qho kev sim siab thiab muaj tswv yim txawj ntse nrog qhov raug.Nws ua raws nrog cov qauv thiab adopts micro computer ua tshuab.Theelement, qhov chaw, ib leeg-nti microcomputer, kov cov tshuaj ntsuam yog txhua yam kev tsim kho uas tsim nyog tsim qauv.Cov haujlwm muaj cov kev ntsuas sib txawv, kev txhais lus, kev kho, qhia, nco, kev nco, luam ntawv, thiab lwm yam.