A [[microresistivity log]] produced by a tool of the spherically-focused type which has [[electrode|electrodes]] mounted on a [[sidewall pad]] which is pressed against the drilled [[formation]]. Because of the kind of focusing method used, the tool gives improved flushed zone measurements over those made from [[microlaterolog]]- and [[proximity log]]-type tools. [[Mud cake|Mud cakes]] with thicknesses up to 3/4 in. have little effect on the measurements of the microspherically focused tool; and, resistivity measurements are made from the region just behind the mud cake where the flushing is most effective. A caliper curve usually is recorded simultaneously.