Mythbusters (2003-2016)

Episode: S02E07, Scuba Diver and Car Capers
Personality: Adam Savage
Watch: Submariner style something?
Submitted by: Marek

Actor: Adam Savage
Watch: YES Zulu

Actor: Adam Savage
Watch: ESQ Beacon

Actor: Adam Savage
Watch: Omega Seamaster Planet Ocean Chronograph
Submitted by: FluffysFailure

Actor: Grant Imahara
Watch: TAG Heuer 2000
Submitted by: Grant Imahara himself via Twitter