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In AutoCad Mech we can set model space value by using AMSYMSCALE command ,they set model space scale value. Check this command AMSYMSCALE in Mech or type option in AM:Standard tab you can find Model Space.
In Autocad how can we get model space value?
If this is for vanilla AutoCAD, it doesn't have the concept of "model space scale". Hence the implementation in Mechanical and other programs. Many third-party developers will use the DIMSCALE value for the active dimension style as the current scale, since they are usually the same.