helix 300mm metric triangular scale rule

this triangular scale rule is a stylish rule suitable for architects. the helix 30cm triangular scale rule has colour coded sides with markings of red 1:100 , 1:200, 1:5, 1:50, blue 1:2 , 1:20 , 1:10, 1:1, green 1:1250, 1:2500, 1:5000, 1:1000. scale rulers are used by architects and engineers to calculate dimension in a blue print or building plan without the use of time-consuming and complicated math equations. the ruler would be ideal for use in the office or at home. SKU:ADIB0027VSH32

helix 300mm metric triangular scale rule