Very easy to use. decent quality. Product: Pleasantly bright illumination and shrill tones when detecting poles. The larger the magnet, the further it can identify. Once you have determined the pole, especially if you are using strong magnets, mark it with a marker. Cons: It uses weird batteries that are difficult to install or replace. They're slightly larger than watch batteries, and you install them by twisting the black cap at the end, beneath which is a standard "plug-in" battery…