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Comprising circular metal table 54mm diameter withthree accurately positioned steel legs and a steel 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 +7x0.01mm - 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
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