生物顯微鏡為例：目鏡為10X，物鏡為10X，總放大倍率為：100X，為計算出實際倍率有沒有 100X。在目鏡中裝入 0.1mm 格值100格（10mm 分成一百格）物鏡工作台上放入 0.01mm 格值100格（1mm 分成一百格）。把目鏡上的十字分劃測量尺與檯面上的十字測量尺重合，如果是百分之百重合，那說明總放大倍率為100的。如果是97%，那就說明是97倍。國家的國標誤差在正負3%，97%-103%都為合格。
Example: biological microscope eyepiece for 10X, 10X objective lens for total magnification: 100X, to calculate the actual magnification 100X.0.1mm grid a value of 100 is loaded in the eyepiece (10mm divided into 100 cells) the objective workbench into a 0.01mm grid a value of 100 (1mm divided into 100 grid).The eyepiece on the cross partition gauge and table cross gauge overlap is 100% overlap, then the total magnification of 100. If it is 97%, it shows that 97 times. Countries GB error of plus or minus 3%, 97% -103% are qualified.
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