-Lots of people make electronics for use in hobby rockets. This is a brief
-list of only the things we've actually used ourselves.
-
-First off, Bdale and friends develop fully open hardware and software
-designs for rocketry avionics, under the name
-[Altus Metrum](http://altusmetrum.org).
-
-We also fly commercial altimeters in some projects. The cheapest off the
-shelf altimeter we've used and often recommend to beginners is the
-[Missile Works](http://www.missileworks.com/) RRC2-mini. At about $80, it
-gets the job done for simple barometric control of dual deployment. Note
-that while early versions had a firmware bug that we believe is at least
-partially responsible for Bdale's loss of his first L3 project, recent
-versions seem fine. For another $20, the
-[PerfectFlite](http://www.perfectflite.com/)
-[miniAlt/WD](http://www.perfectflite.com/catalog/MAWD.html)
-adds the ability to records the barometric flight altitude profile. Both
-of Bdale's L3 certs flew with one each of these two commercial altimeters,
-and we often use the MAWD as a backup for our
-[TeleMetrum](http://altusmetrum.org/TeleMetrum) units during test flights.
-
-The [BeeLine TX](http://www.bigredbee.com/BeeLine.htm) boards from Big Red
-Bee are radio tracking transmitters that just work. They require an
-[amateur radio](http://www.altusmetrum.org/Radio) license, but we think
-anyone flying big rockets can and should get one of those anyway!