Angular: Empty Fiddle

http://angularjs.org/

HTML

<div ng-controller="MyCtrl">
    <select ng-model="selectBox" ng-options="item for item in items"></select>
    <my-directive select="{{selectBox}}"></my-directive>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

myApp.directive('myDirective', function () {
    return {
        restrict:'E',
        scope: {
            select: '@select'
        },
        link: function (scope, element, attr) {
            scope.$watch('select', function(newValue){
                console.log(attr.select);
            });
    }
   }
});

function MyCtrl($scope) {
    $scope.items = ['test1', 'test2'];
    $scope.selectBox = $scope.items[0];
}