An ovulation tester contains: a first body and a second body. The first body is cylindrical and includes a first connecting portion, a first holding disc, and a switch. The switch has a first coupling section which corresponds to a second coupling section of the first body, between the switch and the first holding disc are defined a power supply assembly and a light-emitting element below the power supply assembly, and between the light-emitting element and the first holding disc is defined a light diffuser. The second body is cylindrical and is connected with the first body, the second body includes a second connecting portion for corresponding to the first connecting portion of the first body, a second holding disc for corresponding to the first connecting portion of the first body, and at least one lens in the inner wall thereof below the second holding disc.一種排卵測定器結構,包括:一夾子,於其上端設有一固定凹座,且於其底部設有一套孔;一鏡外罩,係設於夾子之固定凹座,其頂部中央設有一透孔;一鏡模組,係設於夾子其固定凹座及鏡外罩之間;一上蓋模組,係設於夾子其上端之固定凹座,該上蓋模組係包含有一燈組外殼、一發光體控制模組、一電池蓋;又鏡模組包含有一鏡下座、一鏡片組、一鏡上蓋、一載玻片;載玻片上設有迫緊對應鏡外罩之一防滲圈;夾子下端內部中央設有對應套孔之一頂凸。藉此結構,能重覆使用、操作省時省力,並提供不同時間唾液結晶紀錄作輕鬆比對觀看。1‧‧‧夾子11‧‧‧固定凹座111‧‧‧外螺牙12‧‧‧定位凹槽13‧‧‧定位凹槽14‧‧‧頂凸2‧‧‧鏡外罩21‧‧‧透孔22‧‧‧內容室23‧‧‧定位凸柱3456‧‧‧鏡模組3‧‧‧鏡下座30‧‧‧嵌凹部31‧‧‧上容置孔32‧‧‧錐孔33‧‧‧迫緊凸331‧‧‧扣凸34‧‧‧鏡頭軟墊341‧‧‧透孔4‧‧‧鏡片組5‧‧‧鏡上蓋51‧‧‧下容置孔52‧‧‧側凸53‧‧‧中孔54‧‧‧嵌槽6‧‧‧載玻片61‧‧‧防滲圈789‧‧‧上蓋模組7‧‧‧燈組外殼70‧‧‧外螺牙71‧‧‧中隔板72‧‧‧透光孔73‧‧‧支撐緣731‧‧‧扣夾74‧‧‧穿孔741‧‧‧按鍵75‧‧‧內螺牙8‧‧‧發光體控制模組80‧‧‧電池凹座81‧‧‧開關82‧‧‧發光體9‧‧‧電池蓋90‧‧‧內螺牙
