Rolling Parallel Ruler CM | Inch
Multi-Funciton 
 
Size:
30cm * 6cm including roller
 
Measures:
Centimeter and Inch
 
Material:  
Made of PVC material, eco-friendly and good toughness, not easy to break
 
Information printed on ruler
cm | inch ruler
Conversion key : cm - in | m - ft | in - mm | ft - cm
Sin | Cos
Formulation key : Spherical Volume | Spherical Area | Circular Area | Circumference | Length of arc | tan
 
Use:
 
Pattern Making and Design
Drawings - vertical lines | horizontal lines | parallell lines | angles | 3-D Drawings | Circles | Graphs