... test pencil with digital display 1. The cutting head is made of 45 # steel after machine tools cutting, 48 °C high temperature quenching ... tidy.3.the accessory consists of liqiud crystal display,printed circuit board,stainless button,screw,resistor,battery and so on. 4. ... quality and competitive price. voltage tester test pencil with digital display For ensuring all the items are in good quality, ...