Here are level rulers from CROWNMAN measuring tools, including professional models, promotional models, and torpedo levels; Professional model: The material is 1.4mm thick aluminum; the front and back sides are milled to make it more flat; there is a strong magnet inside, which is convenient to use on metal surfaces; The two ends are thickened with rubberized end caps, which is drop-resistant and durable;High-precision overall blisters, both positive and negative directions reach 0.5mm per meter; each is tested for accuracy when producing; it is suitable for professional decoration and construction industries, and it can be used for a long time; Promotional model: This material is 0.7mm thick aluminum; there is a strong magnet inside, which is convenient to use on the metal surface;It is an columnar blister, and the accuracy of the blister reaches 1mm per meter; each is tested for accuracy when producing; it will not change color after long-term use ; and the poor blisters have liquid leakage, and they are easy to change color after a long time. It is economical and practical; Torpedo type: This body is made of new PS material, with a magnetic strip on the measuring surface and aluminum edging; this type of blister is a columnar blister, with an accuracy of 1mm per meter; It is suitable for daily DIY use, small, light, and easy to carry;