It is based on the trigonometrically ratio. It has several scales. Generally, it has two separate consideration

  1. Percent of usual scales: 15, 20, 25, 30
  2. 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


  • It is very easy to use and read ht directly


  • 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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