Cheap ruler calibration, Buy Quality ruler lines directly from China steel pipe and fittings Suppliers: Digital Protractor Inclinometer Angle Finder 0-360 Degree Goniometer Angle Square LCD Scale Protractor Ruler Measuring Tools 8"
Features: Zero setting at any position Reversible display - Read the numbers the right way round when the ruler is upside down - Handy for those awkward jobs! Hold Function - Lock the numbers in when you finish your job! Auto power off Hanger hole on both sides for your convenience