扭剪型專門用來擰扭剪型螺栓，依據螺栓標準選電動扳手；高精度定扭矩首要用在有扭矩要求的場合，依據扭矩巨細選電動扳手；沖擊型電動扳手廉價效率高，但扭矩精度差，首要依據螺栓標準挑選電動扳手。
The torsion shear type is specially used for screwing the shear bolts, and the electric wrench is selected according to the bolt standard; the high-precision fixed torque is mainly used in the occasion with torque requirements, and the electric wrench is selected according to the torque size; the impact electric wrench is cheap and efficient, but the torque accuracy is poor, so the electric wrench is selected according to the bolt standard.
一、看精度
1、 Look at the accuracy
精度高的扳手，會在達到預設扭矩時準確的停止旋轉，特別是對擰緊精度要求高的法蘭螺栓，建議使用高精度扳手，可以有效的避免走漏。德國的電動扳手一般精度為正負3%，為現在全球精度的扳手。
The wrench with high precision will stop rotating when the preset torque is reached. Especially for flange bolts with high tightening accuracy, it is recommended to use high-precision spanner to effectively avoid leakage. The general accuracy of German electric wrench is plus or minus 3%, which is the highest precision wrench in the world.
二、看扭矩
2、 Look at the torque
一般國內扭矩型扳手的扭矩可達10000牛米左右，而德國電動扳手的扭矩可達40000牛米。依據螺栓巨細和工藝要求，挑選適宜的扭矩規(guī)模。
Generally, the maximum torque of domestic torque wrench can reach about 10000 nm, while that of German electric wrench can reach 40000 nm. According to the bolt size and process requirements, select the appropriate torque scale.
三、看轉速
3、 Look at the speed
轉速直接決定了作業(yè)效率，轉速快的扳手，能為操作者節(jié)約寶貴的作業(yè)時間。
Speed directly determines the efficiency of the operation. The wrench with fast speed can save valuable operation time for the operator.
四、看馬達
4、 Look at the motor
現在的電動馬達分為有刷和無刷兩種。
Now electric motors are divided into two types: brush and brushless.
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