Semi-automatic point-marking extensometer

A semi-automatic point-marking extensometer includes a rack, a clamp apparatus, a motor, a transmission apparatus, an extensometer sensing apparatus, a control apparatus and a returning apparatus. The rack is provided with a guide rod which is fixed between the extensometer sensing apparatus and the transmission apparatus. The clamp apparatus is arranged on the guide rod in a sleeving manner and can slide on the guide rod. The transmission apparatus is provided with an eccentric rod which is connected to the motor. The motor is fixed on the transmission apparatus. The extensometer sensing apparatus is connected to the clamp apparatus. The control apparatus is electrically connected to the motor and the extensometer sensing apparatus and is electrically connected to a tension test machine to obtain work data of the tension test machine. The semi-automatic point-marking extensometer achieves manual device starting and automatic device returning, achieves semi-automation and is improved in work efficiency.