250mm Magnetic Slope Angle Ruler with Level Tube and 0.5 Scale Graduation

Square Tube Rounded Corner Drawing Ruler Multifunctional Drawing Tool DY

Slope Angle Measuring Instrument with Magnetic Mount and Level Tube Design

ABS Magnetic Slope Measurer with 10% to 20% Grade Scale and Level Tube

Magnetic Aluminum Alloy Angle Ruler Protractor with 300mm and 400mm Sizes

Multi Functional Ruler with Circle Divider and Angle Protractor Features

Slope Angle Measuring Instrument with Magnetic Mount and Level Tube Design