Combination of a continuity tester, voltage tester for direct and alternating voltages up to 400 V, and a simple tester for residual current devices (RCD). With a removable belt clip featuring a magnetic holder and a robust ABS housing with rubber protection, it is the ideal tester for electrical installations and should not be missing from any toolbox. The option to attach a test lead to the back of the VC-31 facilitates measurements. The display is both acoustic, through a buzzer, and visual, via an LED. The pitch and frequency of the buzzer allow for differentiation between continuity, direct voltage, and alternating voltage.