This “Pen Style” Pro Grade Multimeter is easy to use and manage. This Multimeter will locate faulty wiring, troubleshot problem outlets and diagnose failed light switches. It measures five different parameters: Voltage (AC/DC), Continuity, Phase, Frequency and Resistance. Comes with handy, easy to follow instructions. Double insulated. Maximum rating is 600 volts. Requires two AAA batteries (not included). Note: The “Pen” design, which has one probe built into the body, gives you a measure of additional control because it allows you to easily read the meter while managing the probes.