Xin Si Cheng Technology
circuit and adapters
Replacement PIN Set instruction
OBDEMOTO MST3004 Replacement PIN Set
This product is a universal multimeter replacement pin. It is designed to provide more comprehensive tools for circuit maintenance personnel, making circuit detection more convenient and improving work efficiency.
1)the use of replacement needles:    
Use the red test pen or black test pen of the multimeter. Depending on the environment, you can connect a red or black replacement pin, as shown below:

for example