HP-38B Multimeter Pen Type Meter DC AC Voltage Continuity Tester Testing Tool
Other 3 keys to lock display value, turn on/off backlight, choose resistance, diode or continuity test, change units(DC or AC). Use the toggle switch to select functions and ranges. Resistance Range: 200Ω/2kΩ/20kΩ/200kΩ/2MΩ/20MΩ.