Niigata Seiki SK Made In Japan Silver Carpenter Ruler, Tobi Style, Easy Graduations, Thick Wide Width with Magnet, 30cm Square Thickness, MT-30CMGKD

Securely attaches to steel frames and other surfaces with a powerful magnet. Can be used to set right angles with one hand. Stepped scale with easy-to-read 1mm increments. Large, easy-to-read repeating numbers. Thick material is shock-resistant and less likely to misalign. Equipped with a safety rope attachment hole, ideal for working at heights. For measuring dimensions and checking right angles. Scale Width: 20mm Front Scale: Longitudinal 1 Outside: 30cm² Inside: 25cm (Internal Reference), Side Hand 1 Outside: 15cm² Inside: 10cm (Internal Reference) Back Scale: Longitudinal 1 Outside: 30cm² Inside: 25cm (Internal Reference), Side Hand 1 Outside: 15cm² Inside: 10cm (Internal Reference) Squareness: Less than 0.1mm per 100mm (Scale Side) Length Tolerance: 300mm ±0.2mm