1. Use the "Search Construction" or "Search Compaction" tabs to select a product category, or search by model or size.

2. Select a manufacturer, to show all models of this make.

3. Select a model to view it and all other models of a similar size.

4. If you have registered, you can select up to 5 models to compare side by side. Click the "Compare" button.

5. Use the "Level" tabs to select a level of data to view. The levels available to you will depend on your subscription.

6. Use the "Collapse" or "Expand" tabs to show all the attributes. Click on any section heading when "Collapsed" to view only data in that section.