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![Rocket Builders Marking Guide Accessory for Flying Model Rockets - Estes 302227 Rocket Builders Marking Guide Accessory for Flying Model Rockets - Estes 302227](https://cdn11.bigcommerce.com/s-3vlv0/images/stencil/300w/products/1239/408/Estes_302227_2__63085.1451415063.jpg?c=2)
How high did it really go? Next time, measure it with this easy to use device. Follow the rocket in the sights to apogee, release the trigger to lock the reading. Easy-to-read display gives you your altitude in meters along with the elevation angle. Use two Altitraks for greater accuracy. Great for school and science projects!