The HD Switch Deck Leveling Gage has a Stabilizer Extension used to Make Deck Leveling Easier, faster, and more accurate. Place an Object (like a hammer) on the extension during the deck adjustment, which prevents the gauge from falling over and allows for precision adjustments - Saving Time and Aggravation. The Measurement arm is twice as thick as competitive gauges. This prevents the arm from flexing and provides a much more accurate measurement. The Base of the HD Switch leveler is completely flat, ensuring repeatable measurements.