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2.3 Measurement
2.3.1 Height Measurement
• Use the ruler side of the staff and keep it vertical.
• Adjust the eyepiece and focusing knob to make the reticle and staff images clear
• Read data as shown in fig. 5, H = 1.403m
2.3.2 Height Difference
• Set up the instrument at a point approximately halfway between point A and point B
• Position the staff vertically at point A, take the reading as ‘a’
Example: a = 1.735m
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Fig. 5