Use the NEW AltitrakT to instantly tell how high a rocket flies! Fully assembled and ready to use right out of the package, the AltitrakT measures altitudes as high as 1,300 feet. Simply aim AltitrakT at the rocket before lift-off, squeeze and hold the trigger , then follow the rockets flight, releasing the trigger at apogee. Read the height instantly in the pointer's window or use the degree scale to make your own calculations. Scale reads in meters. Convert to feet using the simple formula or the angle table printed on the package to figure how high the rocket flew. Easy to operate for all ages. Great for contests, clubs or schools.