Abstract: Apparatus and method are disclosed for testing and sampling fluid in an oblong borehole of fracture zones in the area maximum permeability for more efficient recovery and testing in a given sampling period. The tester includes a pair of oppositely extending arms urged against the sides of the borehole causing the tester to rotate until a sampling probe oriented 90.degree. from the arms aligns with the short axis of the borehole. A probe is also disclosed having an elongate slot oriented perpendicular to the borehole for covering a greater horizontal sampling area.