... triangel scale ruler(1:100)10040*20*30 A1. BD8930 1:100, 1:200, 1:250, 1:300,1:400,1:5002. BD6930 :1:1/2, 1:1/4, 1:1/8, 1:3/4,1 ... :3/8,:1:3/16,1:3/32,1:1,1:16, 1:32,1:1.5,1:3 ... 3. BD9930 1:20, 1:25, 1:50,1:75, 1:100, 1:1255. BD9430 1:1000, 1:2000, 1:3000, 1:4000,1:5000, 1:6000.usd0.65PCS6.BD4930 ,Bi-scale 1 ...