LThe primary difference between a ruler and a straightedge is that a ruler is a measurement device whereas a straightedge is a tool for drawing a straight line or checking the flatness of a surface. Nowadays that distinction is generally invalid, it’s all about how you use it.
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306 Ruler
Anodized aluminum ruler with durable printed scale accurate to 0.7mm/m
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308 Straight Edge
Contractor grade anodized aluminum with printed scale accurate to 0.7mm/m
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630 Telescopic Aluminum Ruler
The solid construction maintains the accuracy of the ruler while the telescopic capabilities make it a great measuring tool which can be easily stored.