适用于检查7级或低于7级精度的内外齿合直齿与斜齿圆柱齿轮的周节偏差。操作简便，易于维修，可供各工厂计量室及车间使用。

• This tester is suitable to measure accuracies of pitch deviation with inside and outside straight helical circular gear among seventh degree. Easy to operate and maintenance.