The confined impinging jet reactor (CIJR) has attracted wide interest in the past few years because of the efficient micromixing that it offers. In this work, the CUR is characterized over a wide range of mixing conditions, using three measures of performance: estimates of the energy dissipation rate, micromixing efficiency based oil the yield of a homogeneous reaction, and particle size resulting from a heterogeneous precipitation reaction. The energy dissipation results showed very good agreement between four methods, with values tip to 100 times greater than those observed ill Stirred tanks. The reactions showed a higher sensitivity to mixing conditions, at higher concentrations, with less effect of mixing at high flow rates. The operation of the CIA was very robust to changes in flow rate, with stable performance for up to a 30% difference in the inlet flows.