MaxWilko

Hi there, I wanted to purchase a digilent 410-356 DMM sheild for arduinos. I just need to know two things before purchase; 1st: Can I measure two voltages simultaneously using the same ground? (both voltages will read between 0V-5V). 2nd: Ideally I would have the voltage reading with 4 decimal points, 3 would be acceptable however. Does it have enough resolution to do so on a Arduino Mega2560? Thanks for your help!