  In this work we perform direct single-shot readout of the singlet-triplet
states in exchange coupled electrons confined to precision placed donor atoms
in silicon. Our method takes advantage of the large energy splitting given by
the Pauli-spin blockaded (2,0) triplet states, from which we can achieve a
single-shot readout fidelity of 98.4$\pm$0.2%. We measure the triplet-minus
relaxation time to be of the order 3s at 2.5T and observe its predicted
decrease as a function of magnetic field, reaching 0.5s at 1T.
