Jolly Logic provides some really neat items for the rocket hobby enthusiast. They have three kinds of small altimeters that can be placed in the payload section of your model rocket and record some neat and interesting flight perimeters. The altimeter three can pair up with your smartphone utilizing an application that can be added to your phone. after a flight, you can pair your phone with it for immediate data and then email it to where you would like to share the data. They also have a parachute release mechanism that does not require any pyrogen for deployment.
Here is a link to there product site: