This Alpha 1M Linear potentiometer is a two-in-one, good in a breadboard or with a panel. It's a fairly standard linear taper 1 Megaohm potentiometer. It's smooth and easy to turn, but not so loose that it will shift on its own. We like this one because the legs are 0.2" apart with pin-points, so you can plug it into a breadboard or perfboard.