This watch may be the easiest way you get to see a speedometer read 120. Unless you don’t value your license you aren’t trying it in your car, so at about 4:20 (coincidental time?) you will read 120 on your wrist. It may not be as exciting as in the car, but at least this way you will still have your license, low insurance rates and all of your limbs.
Product Page ($145)
