A gas flow proportional counter designed for use as the detector in a microprobe nondispersive system is described. The counter design incorporates (1) relatively low operating voltage with high multiplication factor, (2) an anode wire support to minimize ``end effects'' on the pulse height distribution curve, and (3) an over‐all design to permit convenient disassembly and replacement of the anode wire or other components. Results of performance studies indicate higher resolving power than similar commercial counters and negligible shift in multiplication factor over a wide range of counting rates.