Zeppo Marx’s Cardiac Pulse-Rate Monitor

Zeppo Marx is the youngest of the five Marx brothers. He played the straight man during his brothers’ wacky shenanigans in their first five films. He eventually left the glamorous world of acting to become a theatrical agent and an engineer. He patented a Cardiac Pulse-Rate Monitor that emits visual and audio cues of changes in a patient’s heart rate.

While these gadgets may not be the very best in the world, these celebrities definitely deserve kudos for their efforts. Have you used any of these gadgets? Which is your favorite?