公制型  数显型                                             英制 / 公制型
                                                                                                                     
         测量范围     货号          精度         备注                  测量范围     货号          精度         备注
         0 - 25mm    331-251      ±2μm        A 型                 0 - 1"      331-351      ±.0001"       A 型 
                            331-261      ±2μm         B 型                                331-361      ±.0001"       B 型
         25 - 50mm   331-252      ±2μm        A 型               1" - 2"     331-352      ±.0001"       A 型 
                             331-262      ±2μm         B 型                               331-362      ±.0001"       B 型
         50 - 75mm   331-253      ±2μm        A 型               2" - 3"     331-353      ±.0001"        A 型 
                             331-263      ±2μm         B 型                              331-363      ±.0001"        B 型
         75 - 100mm  331-254      ±3μm       A 型               3" - 4 "   331-354      ±.00015"       A 型 
                              331-264      ±3μm        B 型                             331-364      ±.00015"       B 型