¡ïIt comes the direct telemetering distance by the triangle
geometry principle way, or surveys altitudes indirectly building,
big tree and so on.
¡ïWave lengths of the two laser are 650nm, may adjust nulls, the
gauging is away from three sections of indications.
¡ïThe plexiglass foundation is 50cm¡Á18.5cm¡Á3.5cm.
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