S2 instrument restores the factory parameters 

S2 meter parameter setting method
1. Quickly double click M key to enter the setting interface, press + key to enter A05.
2. Press M key to input password 1801, M key to confirm to enter the next setting interface.
3. Press + or - key to switch the setting option, press the key ⊙ or M to enter the setting, and press + or - key to set the value.
4. After setting the value, press the key ⊙ or M again to exit the setting, and double click M to exit the setting interface.
S2 instrument factory parameters
P50:1801
A1:48
A2:5
A3:60
A4:18
A5:28
A6:01
A7:12
A8:0
A9：0
A10：2
A11：0000
A12：3
A13：100