Definition of Diameter: a) the length of a straight line through the center of an object. b) a straight line going through the center of a circle connecting two points on the circumference.
If you are at all familiar with the challenges of measuring tree diameter, then you'll appreciate how unique the Criterion RD 1000 truly is. Instead of aligning yourself up with static, black measurement scales, you can now stand where you want and obtain diameter measurements in a matter of seconds.
Having adjustable and illuminated bar scales within a device makes it so much easier to take measurements because you are typically working in an environment that makes your movement limited and has darker lighting conditions.