STAINLESS STEEL RULER BODY - The ruler is made of stainless steel with precision manufacturing, clear scale, CNC machining and comfortable texture. The vertical adjustment knob uses pure copper knurled nuts to easy use. There are 200/300/400mm sizes for customers to choose. There are even two end vertical scales for drawing precision parallel lines to the edge of your work. MINIMUM ACCURACY OF 0.25MM- Minimum accuracy of 0.25mm makes the operation more precise and reduces the error. The ultra-precise marking ruler has tiny holes and slots at each graduation, allowing you to make a point with a pencil or mark a line precisely within the width of a hair! The scale, being recessed and engraved in black, is easy to read. CLEAR ENGRAVING - Clear and precise laser engraving scales. The imported 0.5mm pencil makes the line smoother, The surface is non-reflective and allows even tired eyes under dim light to mark the exact start. Select the appropriate slot or hole, insert a 0.5mm mechanical pencil and mark the measurement with absolute precision. MULTIPLE FUNCTIONS - Achieves multiple functions, including a line horizontal, a vertical line, a long line, a short line, a parallel line and a right angle line, meeting your various marking needs. The 90 shape keeps it perfectly in place while the surfaces to two scales allow you to mark and measure on top, edge and corners simultaneously! SUITABLE FOR - Suitable for positioning and marking mortise and tenon work for woodworking drink. The right angle ruler is precisely what you need for layout and measuring along the edge of a board or other workpiece. Micro-fine marking holes at each scale line allow you to instantly locate your sharp pencil tip or trace exactly on target without any guesswork and eye strain! Ready to work Adjust the spine fine adjustment knob so that the ruler is aligned with the edge of the spine in a vertical state; While writing, fix the holder with your left hand, bring the right edge of the holder closer to the measuring object, and place the ruler on the surface of the object; With your right hand, you can use a mechanical pencil to draw lines. Horizontal line Using the top and bottom edges of the ruler and the scale on the surface, you can complete the horizontal marking. Vertical travel You can pass the tip of the pen through the small round hole corresponding to the ;scale and move the engraving ruler backwards or forwards with both hands to complete the vertical tracing. Short horizontal line Horizontal lines, vertical lines, short parallel lines, etc. They can meet your different marking needs. This line ruler is suitable for positioning and marking in mortise and tenon work. Finer scale The top of the ruler This row can be accurate to a scale of 0.25mm and is made up of four rows of small round holes: The first round hole is a full scale, conforming to the standard. millimeter scale; The second round hole is full scale + 0.25 mm; The third round hole is full scale + 0.5 mm; The fourth round hole is full scale + 0.75 mm. The bottom of the ruler This row is a longitudinal marking hole with an accuracy of 0.5 mm, consisting of two rows of flat holes: < p> The bottom line is the millimeter scale, which corresponds to the millimeter scale; The top line corresponds to at full scale + 0.5 mm.