Reactor’s top selling style for our first five years, Critical Mass offers classic good looks that dress up well but still play hard. If you could have only one watch, a Critical Mass is hard to beat, as it performs flawlessly in the office or in the ocean. Also available in a smaller size for ladies.


  • Individually depth tested to 200 M / 660 ft.
  • Unidirectional rotating timing bezel
  • Triple o-ring screw down crown for superior water resistance
  • Secure screw bar case-to-band interface for superior strength
  • Free-floating lug system for a comfortable fit on any size wrist


  • Case Material                    Stainless, Gold-plated 2-tone Stainless
  • Band                                  Stainless Bracelet, Gold-plated 2-tone Stainless Bracelet
  • Depth Rating                      Individually depth tested to 200 M / 660 ft.
  • Movement                          Quartz chronograph with date, Quartz with day/date
  • Illumination                        Superluminova dial markings and hands
  • Case Size                          40mm
  • Case Thickness                 13.2mm
  • Weight                               198 grams
  • Width at Lug                      29.2mm
  • Width at Clasp                   22mm