Drawing Scale Rule - Lee Valley Tools

Wooden Rules - Lee Valley Tools

Marking and Measuring

Shaped much like a classic school ruler, this relatively narrow rule is lightweight and easy to handle, making it an ideal choice for precise drawing

Veritas 300mm Aluminum Bench Rule

Veritas Imperial Edge Rules - Lee Valley Tools

Wooden Rules - Lee Valley Tools

Machine tool calibration: Measurement, modeling, and compensation of machine tool errors - ScienceDirect

Drawing Scale Rule - Lee Valley Tools

Introduction: The Origin and Development of Olmec Research — Dumbarton Oaks

Drawing Scale Rule - Lee Valley Tools

Buying good tools cheap #2 - The combination square - Paul Sellers' Blog

Lee Valley Wooden Folding Rule - Lee Valley Tools

Pocket Rule - Lee Valley Tools

Combination Squares Popular Woodworking

Drawing Scale Rule - Lee Valley Tools

Veritas 12 Shop Rule - Lee Valley Tools