  We revisit the problem of detection of entanglement of an unknown two-qubit
state using minimal resources. Using weak values and just two copies of an
arbitrary two-qubit state, we present a protocol where a post selection
measurement in the computational basis provides enough information to identify
if the state is entangled or not. Our protocol enables complete state
identification with a single-setting post selection measurement on two copies
of the state. It follows that by restricting to pure states, the global
interaction required for determining the weak values can be realized by local
operations. We further show that our protocol is robust against errors arising
from inappropriate global interactions applied during weak value determination.
