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Symbolic data differ from standard data in that they contain internal variation.
An internal caliper gauge.
Standard deviation is a measure of the spread of data.
Used for internal caliper gauges inside the jaw with two sharp edges it is outside.
A standard CD:- 15mm Internal diameter, 120mm external diameter, 1.1 mm thick A mini CD:- 15mm Internal diameter, 80mm external diameter, 1.1 mm thick