Stratospheric chlorine monoxide concentrations were measured in situ using a new and improved observational method in which the detection package is lowered and then reeled back up. Two reel down and reel up sequences covering 38 and 31 km produced [ClO> profiles which agree with each other to ¿12%. The measured [ClO> profile falls within the envelope of nine previous ''fast'' parachute drop results, but exhibits a different shape, peaking near 32 km as opposed to ~39 km for the average of the previous profiles. These results are consistent with the profiles derived from remote sensing methods, and indicate the need for simultaneous measurements of relevant species.