Dwyer Model PM-1 is a versatile and reliable pen multimeter designed to provide accurate readings for various electrical measurements. With its ability to measure DC and AC voltage, frequency, resistance, and perform continuity and diode tests, this multimeter is suitable for a wide range of electrical applications. It features a user-friendly interface with a rotary selector for easy function selection, three function keys for HOLD, REL, and RANGE adjustments, and a clear LCD display for displaying measurement results.