Voltcraft vc 31 multi tester voltcraft vc 31 p the voltcraft vc 31 multi tester is a combination of continuity tester voltage tester for direct and alternating voltages up to 400v and a simple tester for fault current protective switch fi p p the removable belt clip with magnetic holder and robust abs housing with rubber protection makes this the ideal tester for electrical installations and shouldn t be missing from any tool bag p p measurements are made even easier with the abil