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