FIELD: medicine. SUBSTANCE: bearing member and lock are positioned on rear side of clock cover. Indicating member in the form of disc with index-stop and mounted inside bearing member. One of members is mounted for rotation and interaction with lock. Circular scale of month numbers is arranged on bearing member. Information on indicating member represents physiological cycle zones in the form of sectors positioned in succession. Every sector corresponds to duration of period of individual physiological cycle. Index-stop is placed at beginning of sector corresponding to beginning of cycle. EFFECT: enhanced convenience in use. 1 dwg
