Update README.md

DeanCording · Apr 14, 2018 · 95ebddf · 95ebddf
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-The third number is the measurement digits as a signed magnitude binary number (msb is sign bit). It is converted to the floating point measurement value by using the number of decimal places as specified in the first number.
+The third number is the measurement digits as a [signed magnitude binary number](https://en.wikipedia.org/wiki/Signed_number_representations#Signed_magnitude_representation) (msb is sign bit). It is converted to the floating point measurement value by using the number of decimal places as specified in the first number.