Kestrel Elite Weather Meter with Applied Ballistics Employs the Applied Ballistics bullet library of custom drag models, an exact measurement of your bullets drag profile plus corrections for Aerodynamic Jump, Spin Drift, Coriolis, and Drop Scale Factoring to achieve accurate long-range shots Measure up to 15 environmental parameters at your fingertips Improved high resolution screen for any lighting (even sunlight) and easy on your eyes; Intuitive user-interface screen navigation Scratch and breakage-resistant window Made in the USA Energizer Brand Ultimate Lithium AA batteries for improved reliability, capacity, cold-weather performance and weight