1. MULTI ANGLE MARKING: This Extendable depth measuring ruler supports accurate marking , making it highly suitable compatible with woodworking, handcraft projects and professional workshops. The angle can be easily adjusted with the rotatable knob, ensuring nice position every time 2. FIRM AND NON SLIP: The innovative rotating knob of the position marking protractor allows compatible with quick adjustment of angle and position, and then firmly locks in place to prevent sliding during use. 3. HIGH VISIBILITY : The multi angle depth measuring ruler has crystal clear horizontal bubbles and an super accurate calibration function, enabling immediate horizontal inspection. Whether you are hanging shelves or aligning workpieces, the highly transparent design ensures easy reading 4. FIXED POINT MARKING: Foldable depth measuring ruler is designed with dedicated marking capabilities to create accurate reference points on wood, drywall, and other materials. The non slip limit keeps the ruler stable during operating to achieve errorless measurement 5. LONG LASTING AND PORTABLE: This compact depth ruler is made of sturdy aluminum alloy and is foldable, making it easy to store in a toolbox or pocket, which is highly suitable compatible with contractors, carpenters and amateurs who require trusted work Color: As Shown Material: Aluminum Alloy Package Contents: 1*Scribing Level Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.