This free App from Tec-Ease, Inc. is our GD&T App Lite version and gives you access to 25 GD&T Tips and videos. Each Tip includes an easy to understand explanation of a GD&T concept, a graphic and video of Don Day explaining the Tip. Topics include Datums, Profile, Position, other Feature Controls and more. This App is a preview of our full GD&T App that features over 250 GD&T Tips. Install it, use it and when you fall in love with it, become a member of the Tec-Ease, Inc. Premium Site for access to the full version of our GD&T App.