EOTech LWTS Light Weapon Thermal Sight - Manual (Page 50)

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2.20 RETICLE (RET) (Continued)
The stadiametric scale is used for range estimation purposes
from 100 to 1,000m. The vertical axis is designed to show
the width of a 10 foot tank at various range intervals. The
horizontal axis is designed to show the height of a 5 foot
man at various range intervals.
Figure 2-28. Range Estimation – Stadiametric Scales.