| 摘要 |
A device for use in grading operations and includes an elongated rod having front, rear and side surfaces. The endless band is formed by a first band portion of a given color and having a first set of graduations extending from zero at one end thereof to a first value at the other end thereof and a second band portion of a color clearly distinguishable from the given color and having a second set of graduations ascending from zero at one end thereof to a second value at the opposite end thereof. Attached to the one end of the first band portion is the one end of the second band portion while the opposite end of the first band portion is attached to the opposite end of the second band portion. A slide mechanism is mounted for longitudinal sliding movement on the elongated rod and includes a clamp for selectively securing the slide mechanism to the endless belt.
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