Small and Light Makes it Convenient to Carry. Powerful built-in magnets on the base secures the attachment to any iron surface. VA screen display greatly enhance the reading experience, the lighted up numbers & letters with black background make it very easy to read, even in bright sunlight or poor light. The display was inverted automatically when the upside is down. Auto power off after 3 minutes of no operation. Description: Angle finder/protractor provides quick&accurate measurement in woodworking, construction, machinery, telecommunications, automobile etc. VA screen is convenient to read. Small and light, it is real easy to be carried and used. The magnet in base secures allow you to attach the gauge to any steel object. It is especially easy to measure the pitch of helicopter, bevel angle of miter saw, automobile test and repair and so on. Specification: Measuring Range:4x90° Accuracy:±0.2° Resolution:0.05° Size:36x36x20mm Net weight:27g Waterproof:IP54 Power:3.7V 260mAh lithum battery Colour:Black Material:Plastic Package Contents: 1 * Digital Angel Finder 1 * USB Cable 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.