The Karpinski Mental Clock is a wooden case that houses a metal, analog clock face which can be used in a variety of mental magic effects.

This specially crafted prop allows the magician to quickly discover what time an audience member has set the clock to. The mechanism operates with no electronics, batteries, or powered lighting panels often found in similar props. The exterior case of the Karpinski Mental Clock is created from walnut. A small clasp on the side holds the front door in place. When the door is opened, it reveals an upright clock face and a single clock hand. The center knob on the clock face can be turned to rotate the clock hand.