Gears with reduced tooth depth(internal gear)
已减低齿高的齿轮（内齿轮）
At gear teeth with reduced tooth depth, the measuring balls do not fit the tooth surface but the gable bottom(Fig.9). For this we offer flatten measuring balls.
在已减低齿高的轮齿上，测定量钢珠无法通过轮齿表面但是可以通过齿