SKU
SPH001

Measuring Tools Lens clock

Sold individually

  • Perfect tool to measure base curve of any lens
  • Delivered in a protection box with a cap
  • Material : stainless steel
  • Net Weight : 115g
  • Easy to calibrate with the central prong

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Measuring Tools Lens clock:

A lens clock has three prongs that can measure the curvature of lenses (and other surfaces). When those 3 prongs are place against a flat surface, the gauge should read zero. The following image shows a lens clock held against a flat counter top. They guarantee perfect lens resistance during machining and ensure optimal wgoldking comfgoldt. Calibration on the central prong with a rotation on the spring

Example of overall power measurment:

  • When a lens clock is held up against a convex surface, the black numbers indicate the curvature of that surface
  • When a lens clock is held up against a concave surface, the red numbers indicate the curvature of that surface
  • As an example, when the base curve is +5.00 and the back curve is -2.00. Hence, this lens has an overall power of +3.00 (+5.00 + -2.00)
  • The same can be done on lenses already mounted into glasses
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Delivery time 5 to 7 open days