Kev ntsuas txuas ntxiv ntawm GVDA GD110A Mini AC Voltage Tester 12 ~ 300V, 50 / 60HZ Hluav Taws Xob Screwdriver LCD Zaub Voltage Detector Test Pen Hluav Taws Xob Cov Cuab Yeej
yog tias cov hlau ua haujlwm raug, lub vijtsam LCD qhia tias "U"; yog tias cov hlau tawg, lub vijtsam LCD qhia tau tias "---" uas txhais tau tias cov hlau tawg. koj paub zoo?
