macro to delete elements by min length

You can use hm_getelemcheckelems command.

Example:
hm_createmark elems 1 'by config' 104;
set fail [hm_getelemcheckelems 1 2 length below 1.0];
hm_createmark elems 1 $fail;
*deletemark elems 1;

Thanks,
Imoto