For Him


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