To do comparative analysis test of the same person in two times with quantum magnetic resonance analyzer,if you want the results are accurate,you need to keep some data are the same in the two time,1.the same people with the same data(name,sex,age...) 2.the same computer 3.the same hand to grab the detection bar.Today we bring you the comparative analysis test of one people in 20 minutes.The details are below,you can have a look.Thanks!