1. The value of the supply voltage or the magnitude of the currents flowing in the resistors does not affect the
result. This means that the supply voltage need not be stabilized, and that the circuit currents can be kept to
low values for a component where the self heating effect of the current flowing could affect the result.
2. The galvanometer current accuracy is unimportant, since, under balanced conditions, the current in it is zero.
The main characteristics required for the galvanometer are a low resistance and a high sensitivity so that a
small deviation of voltage from zero produces a large scale reading.