The Extech MN47 compact, manual-ranging Digital Mini Multimeter is equipped with the extensive capabilities a tradesman or technician can use every day while also perfect for a hobbyist, hacker/maker, or DIYer working on home improvement and A/V projects. In addition to its electronic and electrical testing functions, the MN47 adds value with a built-in non-contact voltage detector. You won't have to search for a voltage pen in order to quickly and safely check for voltage prior to attaching the multimeter's test leads to the device under test. A bright red LED alerts you to the presence of voltage.