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Model rocket altimeter consists of an all-CMOS microcomputer that is coupled to an atmospheric pressure sensor via signal-conditioning circuitry. The unit is powered by a 9-volt battery, takes a pressure sample every 0.25 seconds, and stores 1000 data values in memory during the flight. Est. cost: $135 (kit).
ELECTRONICS EXPERIMENTERS HANDBOOK 1992 pg. 89

Lightweight strobe-light circuit suitable for tracking night launches of model rockets.
POPULAR ELECTRONICS [2] Jun 1990 (v.7#6) pg. 28

Electronic altimeter for a model rocket takes a pressure reading every 0.25 seconds and stores 1000 data values in memory during the flight. Suitable for use in D-, E-, or F-motor powered model rockets. Est. cost: $135.
RADIO-ELECTRONICS Oct 1990 (v.61#10) pg. 37

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