呢幾部計數機的分別(40分!urgent~)pls help~

JS-140V
Digits: 14
Independent memory: Y
GT: Y
%: Y
Profit margin %: Y
Square Root: Y
+/-: Y
Backspace: Y
3-digit comma markers: Y
H/M/S: Y
5/4: Y
Cut Decimal selector: 0,1,2,3,4
ADD mode: Y
Power supply: Two Way Power
Dimensions (mm): 24.6 x 107.0 x 176.5
weight (g): 180g

JS-120TV
Digits: 12
Independent memory: Y
GT: Y
%: Y
Profit margin %: Y
Square Root: N
+/-: Y
Backspace: Y
3-digit comma markers: Y
H/M/S: N
5/4: Y
Cut Decimal selector: 0,1,2,3,4
ADD mode: Y
Power supply: Two Way Power
Dimensions (mm): 24.6 x 107.0 x 176.5
weight (g): 180g
Others: Tax calculation

JS-40V
Digits: 14
Independent memory: Y
GT: Y
%: Y
Profit margin %: Y
Square Root: Y
+/-: Y
Backspace: Y
3-digit comma markers: Y
H/M/S: Y
5/4: Y
Cut Decimal selector: 0,1,2,3,4
ADD mode: Y
Power supply: Two Way Power
Dimensions (mm): 24.2 x 107.0 x 174.5
weight (g): 195g

I am using JS40V, the keytouch response is better than the other 2 models. I hope the information helps.