Carbon steel construction, durable in use Knurled screw for locking the rod 40mm wide hardened steel edge Ideal woodworking tool for a variety of marking jobs Perfect for engineers, craftsmen, modelers, etc. Package includes: 1 x Marking Gauge Features: Material: Carbon steel Graduation: 0.1mm Measuring range: 200mm Product name: Scribing ruler Material: Carbon steel Scale process: Magnetic stripe film Specification: 0-200mm Division value: 0.1mm PackageCarton packaging [Accuracy] ground 0.1mm [Thickness] The ruler body is about 3mm (main ruler) Size: 170*57*30mm 1. Check whether the zero scale lines of the main ruler and the auxiliary ruler are aligned. If they are aligned, they can be measured; if they are not aligned, the zero error should be recorded. 2. The scale on the main ruler is in centimeter units, for example: the zero scale on the auxiliary ruler is between 11 and 12 on the main scale, then the scale on the main ruler indicates 11cm (110mm); from the figure, the integer