Range 0 to 350 Leastcount 0.2 mm Vernier Rotary Scale
-The Zone Reader measures the diameter of the Inhabited Zone
To 0.1mm within range of 0 to 35mm.
Light from source in the base passes upthrough the transparent and semitransparent portion of the Agar then to a reflecting
Mirrorsupported by an arm above the unit.
The mirror reflects the light to a glass prism mounted at the front of the unit and them agnified image of the zone of Inhabitantsis clearly visible on the prism