The steps are as follows.

Press “high/low”+“on/off” combination key
Choose “switch to 1”
Press “on/off”+ “run/pause” combination key
Press “Z-”
Press “MODE”,for change model from “continue”to “step”
Press “Z-”
Press “OK”,The tool will change from T1 to T2.
Press “Z-”
Press “MODE”,for change model from “continue”to “step”
Press “Z-”
The video is as follow.