Comprising circular metal table 54mm diameter with threеaccurately positioned steel legs andasteel screw thread working in a long adjustable brass bearing. A circular scale is carried on the thread and a vertical scale on the table, enabling accurate micrometer type reading to be taken.

SPECIFICATION

– Range-7 to +7×0.01mm
– Vertical scale 7-to + in 1mm divisions
– Dial 48mm diameter: divided in to 50 divisions, each representing 0.01mm, figured clockwise.
– Screw thread 0.5mm pitchx6mm diameter
– Size of spherometer suitable for lenses and mirrors 50mm or more in diameter, overall height in scale on zero, 55mm approximately.

Accessory included Flat glass plate 50x50mm for checking zero.