This aluminum stair measuring ruler achieves 0.05mm error control, ensuring accurate measurements for stair installation and furniture where precisions is critical Integrated scale fits various stair types and woodworking tasks like floor cutting and door / window installation, making it a multi functional tool Available with or without a storage bag to suit professional carpentry teams needing bulk storage or individual users preferring lightweight convenience Features a compact size with foldable structure for easy carrying, ideal for mobile carpenter or working in tight spaces The optional storage bag version enhances organization Make of aviation grade aluminum alloy with rustproof properties, offering 3x longer service life than rulers, perfect for humid or outdoor worksites, Manufacturer: Whoasyst