Follow the rocket in the sights to apogee, release the trigger to lock the reading. It is that easy.
Use two Estes Altitraks for greater accuracy.

Instantly Tells You How High Your Rocket Flies!
Trigger mechanism locks in peak altitude
Great for contests, clubs and schools

Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.