A ruler is an instrument used in geometry, technical drawing and engineering/building to measure distances and/or to rule straight lines.The ruler is the instrument used to rule lines and the calibrated instrument used for determining measurement is called a measure. However, common usage is that a ruler is calibrated so that it can measure.
Types of Ruler
- Carpenter's Rule
- Retractable Rule etc.
- Camlin
- Natraj
- Faber Castel