Where can I find three rulers in the inner city of Shushan?

Go to Ugly, Shenyang, collection room and Ren to open the door (it must be opened, otherwise there will be obstacles in the tunnel, and you can't get through). Then enter the tunnel from Yaojuxin and find the jasper ruler and the ruby ruler. Then go out and return to the inner city, then enter the tunnel from Yao Ju C, turn on the mechanism, and then find the sapphire ruler in the tunnel. Coming out of the tunnel, I returned to the residence of Liaori. Clicking on three of the tables will prompt that the things on the tables are different from the others. At this time, put three weighing scale on it (note that it will not happen automatically, and you must use the item column).