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This slide show has instructions for measuring the tactile acuity of your fingertip and palm, using the Method of Constant Stimuli. In the process, you will create a psychometric function for each body part, and you will use it to determine what your two-point discrimination threshold is. A low threshold means you can distinguish two points that are very close to each other, which means you have good acuity.

 
https://docs.google.com/presentation/d/e/2PACX-1vQPu1QTspWM4Pq7b_8zTDB1lFQtso0aOTh6pON8S7pNjGlC0vVWDcqxIJ1vsJ5H5WV7pj7fhaMRl4tK/embed?start=false&loop=false&delayms=3000