DC/AC voltage measurement of China GVDA Mini Digital Multimeter GD103B
1) Turn the knob to DC voltage or AC voltage shift and select the appropriate range.
2) Insert the red probe in “ 
” socket，insert the black probe in “COM” socket。
3) Contact the probe to the measured circuit (connect to the measured power supply or circuit in parallel), measure the voltage.
4) Read the measurement result on display.
