What are the limitations of the Wheatstone Bridge?
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The Wheatstone bridge is a very sensitive device; therefore, it is possible that the measurements using a Wheatstone bridge may not be precise in an off-balance condition.
Wheatstone bridge usually measures resistances that are in limited ranges from a ohms to kilo-ohms which means that for high resistance measurements, the galvanometer is insensitive to imbalance.
The other drawback is that, due to the heating effect of the current through the resistance, the value of resistance changes; therefore, extreme current may even cause a permanent change in the value of resistance.
If the four resistances are not comparable, the sensitivity of the circuit reduces.