Kestrel 4500 Bluetooth Shooters Weather Meter with Applied Ballistics Calculator Olive Drab 4500ABFeatures: Calculate accurate elevation and windage targeting solutions for long range rifle shooting. Use either G1 or G7 ballistic coefficients, OR select from the entire library of Applied Ballistics Custom CurvesTM for more than 200 common long range bullets. Access to the entire Applied Ballistics Custom Curve library requires the Applied Ballistics Profile Loader PC application together with either Bluetooth® data transfer capability on the Kestrel Meter and PC, or the Kestrel Computer Interface accessory. The Applied Ballistics Profile Loader is a free download from the Kestrel website. Train the software to match your specific rifle based on observed impacts at subsonic and supersonic ranges with the True Muzzle Velocity and Drop Scale Factor capabilities. Built-in crosswind calculator and target range estimator. Select “Weather Mode” to measure up to 15 environmental parameters at your fingertips. Kestrel 4500 Olive Drab Weather Meter 0845ABOLV