Boy Playing With Folding Ruler

Measuring and calculate distance on map.

Father and Son Using Folding Ruler

People are passing by thermo-graphic camera at Incheon International Airport

CU Shot of man measuring out fabric with ruler and clover chalk / South Africa

/ height rule decides child's age - if it's 44 inches, it's 6 years old - regardless and you pay full fare / family getting onto a trolley / conductor measures girl by placing his hand above her head / several girls are measured and...

Fashion Designer working in studio

A researcher with gloved hands uses a ruler to measure a dead rat.

Engineering Office

Carpentry teacher guiding student with ruler and blueprints in workshop classroom

Carpenter draws lines on wooden board with pencil and ruler

Engineering equipments on the blue prints

Over the shoulder Female Architect drawing on blueprint

Ja Rule at the DCMA Collective Celebrates Grand Opening of Flagship Store on March 15, 2008. (Footage by WireImage Video/Getty Images)

Designer is working with specific tools

Architect working on Blueprint

Designer is scribbling with a marker on white paper...

The Stoke City Manager runs the rule on fixture conspiracy slaps down a Sky Sports reporter over negative questions regarding Tevez and covers Stoke's great start to the season at Clayton Wood Training Facility on September 28, 2011 in...

Engineer having coffee break

Businessman working in an office

Measuring coral growth on Artificial Cement Reef Balls, Maldives

Measuring coral growth on Artificial Cement Reef Balls, Maldives

Father Teaches Daughter to Fire a 22 Caliber Rifle at Maryland Small Arms Range on January 20, 2013 in Upper Marlboro, Maryland (Footage by Getty Images)

Drawing a line with blue marker on a checkered paper