Voltage: AC 100-500V; Overall Size: 131 x 15mm /5.16 x 0.6 Inch(L*D). Slotted/Phillips Screwdriver Head Size: 3.5mm / 0.14 Inch; It can work as a circuit tester or a screwdriver, makes work more convenient. The voltage tester pen is used for testing the circuit and distinguishing whether the...