To evaluate the anisotropy of single crystals with a size of several tens of micrometers, we develop a technique for measuring the local transport properties along both the ab-plane and the c-axis using microsize devices fabricated by a focused ion beam process. We applied this technique to identify the resistivity anisotropy (gamma(rho) = rho(c)/rho(ab),) of the iron-pnictide superconductor PrFeAsO0.7 synthesized under high-pressure. The obtained value of gamma(rho) similar to 120 at 50 K indicates the presence of strong anisotropy, which is comparable to the anisotropy measured by other methods. The weak temperature dependence detected for the normalized resistivity along the c-axis (less than 10% difference at 280 K and 50 K) suggests a peculiar interlayer transport mechanism for PrFeAsO0.7. (C) 2010 Elsevier B.V. All rights reserved,