Jolly Logic AltimeterTwoThis device does not have a warranty beyond the initial opening It is durable but not indestructible Rocket flights can be violent, and the device can be damagedFeatures of Jolly Logic AltimeterTwo Measures peak altitude to 29,500 feet (9,000 meters) Measures top speed in MPH or KPH Tiny: 057 x 071 x 193 (145 x 18 x 49mm) Re..