Roj teeb Polarity Detection ntawm GVDA GD110A AC Voltage Tester 12 ~ 300V, 50 / 60HZ Hluav Taws Xob Screwdriver LCD Zaub Voltage Detector Test Pen Hluav Taws Xob Cov Cuab Yeej
Thaum lub tester qhib, nias thiab tuav lub pob thaum kov qhov kev sojntsuam mus rau lub davhlau ya nyob twg zoo, lwm tus tes nias thiab tuav lub davhlau ya nyob twg tsis zoo. yog qhov polarity yog lawm, lub vijtsam zaub "--P" thiab lub suab nrov. yog tias nws rov qab txuas, tus cwj mem xeem tsis teb.
