Command: cannoscale
Enter new value for CANNOSCALE, or . for none <"1/8" = 1'-0"">: 1/4\" = 1'-0\"
Command: cannoscale
Enter new value for CANNOSCALE, or . for none <"1/4" = 1'-0"">: 1/8" = 1'-0"
...
(getvar 'CANNOSCALEVALUE)
(/ 1 (getvar 'CANNOSCALEVALUE))