It is based on the trigonometrically ratio. It has several scales. Generally, it has two separate consideration
- Percent of usual scales: 15, 20, 25, 30
- Horizontal Distance from tree: 15, 20, 25, 30
Use: Observer should be standing at given distance so that ht can be
Parts: Eye piece, Pronges, Scale, Striger, Release striger, Tunning knob
Advantage:
- It is very easy to use and read ht directly
Disadvantages:
- It needs to measure the distance first sometimes in sloppy areas it may be difficult
- Shaking hands make default reading easily calculated
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