Brown & Sharpe Rigid Tempered Steel Rules
B&S 599-313-620 metric ruler shown above. Both sides have identical scales.
Tempered, rigid (non-flexible) steel rulers. There are four scales, two on each side. Where both systems are included, this allows for quick switching between inch and metric. Rules with just metric divisions means you don't have to turn the ruler over to find the correct graduations, making it a convenient time saver. These solid, high quality steel rulers are still made in the USA by one of the oldest and most respected American manufacturers of precision measuring tools. As with all steel rules, the readings are guaranteed accurate at room temperature (20 degrees Celcius / 68 degrees Farenheit).
The following rulers can only be purchased online. Click the links shown below. Sizes larger than six inches are only available in theory, rarely in practice. Calibration certificates are not available for these rulers. Metric dimensions are shaded yellow.