in the http://digilentinc.com/Data/Products/ANALOG-DISCOVERY/Discovery_TRM_RevC_1.pdf, page 12, the Vin range is defined for Low Gain and High Gain. The ADC has 14 bit. The vertical resolution is (Vin Max - Vin Min)/(2 ^14). Obviously, the accuracy is worse than that. It depends on calibration, temperature, probes, etc. The horizontal resolution is the sample rate, displayed on to of the scope screen. (8192 samples at xxx kHz/xxx us)) It depends on time scale. In fact, the scope always samples at 100MHz/sec, but decimates or averages multiple samples for storing, when needed.