I have a form with multiple data entry text boxes. The one in particular is named Stack_height with a control source of Stack. I would like to limit the input of this text box to 0.70 thru 6.0 general numbers. If anything other than this range or null is entered I am trying to clear contents of stack_height and set focus again to stack_height and display a msgbox with helpful information. I am trying to do this within Access VBA using the lost focus event. I can't seem to accomplish this. Please reply with any suggestions. Thanks so much.