High-quality materialDoor gap measuring tool is Made of high-quality materials, the scale is clear and easy to identify, durable, not easy to damage, and can be used for a long time. Easy to carryThe size of the feeler gauge is 152 17 15 mm and the weight is 84g, which is small and light in weight, and has a lanyard on the handle for easy portability Vernier feeler gaugeThe fire door gap gauge checker tool has a vernier design, which can easily read the measurement results, and is an ideal measurement tool in your engineering inspection projects. Clear readingThe measuring range is 1-15mm, and the accuracy is 0.5mm. It can measure the gap, width and flatness deviation of various materials. It is light and easy to operate. Wide applicationWedge shaped vernier feeler gauge can be used to measure fire door clearance, door clearance measurement, thickness measurement, house inspection, engineering measurement, etc.