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How do I measure a shell that my hermit crab is still wearing? You can use the bottom portion of a caliper to measure the opening size of the shell your crab is currently in. The image below shows how to hold the caliper. The measurement is read below the zer How do I measure different types of shells? The photo below demonstrates how we measure each style of shell. Round Shaped Opening Shells are measured inside left edge to inside right edge. Elliptical Opening Shells are measured from just insid How do I read The Hermit Crab Patch Caliper? The caliper measurement is read below or above the zero. The images below show the readings from 1/4 inch to 1 inch. How do Shell Opening Size and Shell Opening Shape relate to Crab Size. This chart is intended to aid in demonstrating the relationship between different shell types and the size of crabs wearing them. For example a customer may have a crab that is wearing a Sharkeye My crab is wearing a 1" opening Sharkeye shell, is this the same size as a 1" opening Green Turbo shell? The Sharkeye has a D-shape opening and the Green Turbo has a Round shape opening. A 1" Round opening is not the same as a 1" D-shape opening. Explanation: For a given shell opening size, a D-shaped o Why do you list your shell opening sizes for each 1/16"? We decided to size our openings for each 1/16" up to 1 1/4" to give our customers a better way to convey the size shell they would like to purchase. Explanation: We do not want to imply that purcha