Ways to measure the vertical height of a common limpet apex?

Can some one give me some suggesions please? Apart from using a ruler as it is too inaccurate

One Response to Ways to measure the vertical height of a common limpet apex?

  1. I use measuring callipers like these
    http://shop.etoolscity.com/shared/viewProductImage.html?http://ecx.images-amazon.com/images/I/31p9hzLNrYL.jpg

    only mine are years old and not digital, but still very accurate

    John H

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