Accurate Gap Measurement (1–15 mm) – Designed with a precision wedge shape ranging from 1 to 15 mm, this tool allows for accurate measurement of door gaps, floor clearances, and fire door compliance. Clear 0.5 mm Scale Increments – Features easy-to-read 0.5 mm graduations, ensuring fast and reliable readings during inspections, installations, or daily checks. Durable and Hard-Wearing Material – Made from strong, impact-resistant engineering plastic that withstands frequent use without warping or damage—perfect for on-site professionals. Portable and User-Friendly Design – Lightweight and compact, ideal for single-handed operation in tight spaces. Fits easily into toolboxes or pockets for quick access on the job. Multi-Purpose Engineering Tool – Suitable not only for checking fire door gaps but also for floor levelling, hinge alignment, and property inspections. A must-have for engineers, surveyors, and building professionals., Weight: 0.0220462262 pounds, Manufacturer: strrng