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How to adjust an altimeter so that the needle and millibar indicator are in agreement.
E.A.A. TECHNICAL COUNSELOR NEWS Jan-Mar 1990 pg. 7

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

Portable electronic altimeter responds to ambient air pressure to provide altitude readings up to 5,000 feet in 1-foot increments.
MODERN ELECTRONICS [2] Jan 1990 (v.7#1) pg. 42

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

Digital altimeter. Pocket-size unit provides readings from 0 to 1999 feet (in 1-ft increments) and is battery powered.
RADIO-ELECTRONICS May 1992 (v.63#5) pg. 50
Added Info ELECTRONICS NOW Oct 1992 (v.63#10) pg. 14

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