The Dwyer PM-1 digital multimeter is an ultra-compact pen style instrument ideal for general electrical testing and troubleshooting. A few applications include HVAC, automotive, electrical/power, and environmental monitoring uses. This meter measures DC and AC voltage to 600 V and resistance to 40 M Ohms. In addition to volts and ohms, the digital pen meter includes continuity, diode, and frequency tests to 10 kHz. This meter features data hold, REL (relative value), and auto range buttons. The 4 digit LCD displays value, mode, and low battery indication.