Abstract: An instrument package (or telemeter) designed to be carried by a projectile uring test flights thereof and to process and record performance and/or meterorological data during such flights. The data is obtained from a plurality of on-board sensors and after signal conditioning the sensor outputs are sequentially sampled and the samples digitized before storage in memory. The stored data may be easily recovered after the projectile impacts by means of a portable interrogator unit. The package is designed to withstand the shock of the projectile's firing, flight, and impact.