Protractors by TBVHOMM. Details:Why choose TBVHOMMDigital Angle Finder? Are you still using visual inspection or traditionaltools to determine the angle of your equipment? The error is too big! Can it be more accurate? TheTBVHOMM digital angle finder combines ruler and protractor, can measure bothlength (in metric/inch unit) and internal and external angle. It calculatesangles accurately and shows on the digital display clearly. Plus it has stablelocking function that lock measurement at any angle. Useful to applicationssuch as automobile, tools, constructions, boating, woodworking and machining. Great Locking Feature - The tight/loose knob works well and youcan set the tightness to suit your use! Large HD LCD- Large LCD display with locking and reversing anglefunctions for easy reading of measurement results! Low Power Consumption - Simple, precise and fast with workingmore than 2000 hours with only one piece of standard coin battery! Accurate Reading – Standard,clear and precise...