The calibration of electrostatic triple‐probe voltage and current response in a supersonic continuum plasma has been carried out using a low‐pressure shock tube. The electron temperatureTeand charge number densityNeare compared to probe voltage and current response, respectively, for a useful range of plasma parameters (1≲Rp/&lgr;D≲10, 2≲M≲5, and 7<&fgr;13<35, whereRpis the probe radius, &lgr;Dis the Debye length,Mis the shock Mach number, and &fgr;13is the nondimensional probe voltage). The dependence of probe response on Debye ratioRp/&lgr;Dand various flow parameters was investigated. The probe voltage response was found to depend significantly on the Debye ratio. Expressions for electron temperature determination by triple probe are presented.