The Power Probe 3S is a digital voltmeter that provides diagnostic power with the flip of a switch. This tool is designed to simplify testing of fuse boxes, verifies correct operation of motors, lights, relays and wires. This design also has the ability to rotate the screen 180 degrees. The PP3S has compact, ergonomic housing for secure grip and improved circuit access.The PP3S has a menu-driven screen that makes accessing all the different test modes easier, the company says. The tool features a screen and high-resolution display, as well as a flip screen feature to allow for display screen readings while holding the tool upside down.