The GDM-9061, with front/rear input terminals, has two 
input terminals for current measurement: the 3A terminal 
for current less than 3A and a 10A terminal for 
measurements up to 10A, which can measure between 3 
~ 10A for both AC and DC current. On the other hand, 
for the GDM-9060, which has no rear input terminals, 
nor 10A terminal, it offers merely a 3A terminal for 
current measurement less than 3A. 
The measurement will switch to ACI, DCI mode 
immediately. See the figure below for example.