$("#myform").validate(
      {
        rules: 
        {
          items: 
          {
            required: true,
            min:1
          },
          amount: 
          {
            range:[10,100]
          },
          factor:
          {
            required: true,
            range:[0.08,0.09]  
          },
          dullness:
          {
            required: true,
            range:[-9.5,11.1]
          }
        }
      });