T' AltimeterOne is a small barometric altimeter that will tell you how high your rocket, shiver me timbers, airplane, or kit has flown (works on water rockets too!). Avast, me proud beauty! This video tells you how t' turn it on, zero it out, ya bilge rat, and hook it up t' your flyin' machine. Begad! When you get it back, shiver me timbers, it tells you exactly how high it went.