Feature: 1. Aluminum alloy frame 2. With three bubbles with high precision,1 horizontal 1 verical 1 45-degree 3. With very high sensitivity to variation of measureing surface and very high transparentvials 4. Can be printed metric and inch graduation 5. The surface of frame is sprayed yellow plastic 6. Specification:12",16",20",24",32",40",48",60",72",80" 7.Thickness:0.4mm,0.6mm,0.8mm,1.0mm

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