At what point the temperature of refrigerator/frig going high or low ? For example the numbers are given 1 ,2 ,3 ,4 ,5 some people set at 5 or some people set at 1 at which figure temperature is high or low?
I doubt that there is a worldwide standard for all refrigerators. After all, it is just numbers painted on a knob, every manufacturer can paint there whatever they please.
You have to measure the temperature to know exactly where you get the optimal 4 Celsius. But even without measuring, you can leave it for a few hours at one end and you will notice if it is too cold or too warm.
Alternatively, just look up the user manual.