Machinery manufacturing: adjustment of the horizontal and inclination position of the machine tool table Construction engineering: road and bridge slope detection, etc Communication installation: elevation angle measurement of base station, satellite and TV receiving equipment Home decoration: level measurement of plane and equipment, level measurement of installation parts Others: railways, water conservancy, biology, medicine, industrial automation and other fields that require level measurement backlight Inverted display function Horizontal calibration REE relative measurement HOLD display lock Automatic shutdown Switching between 3 modes of slope 0/90 prompt tone (B, C) Fall protection Electromagnetic protection level 3 Measuring range: 4x90 Accuracy: 0.1 Resolution: 0.05 (The product printed words depending on the batch, but this does not affect use) Color: A:Yellow Material: ABS Package Contents: 1 x Horizontal Scale Ruler Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.