Kestrel Notice regarding the MagnetoSpeed’s new barrel cooler, Riflekühl: We are seeing the Kestrel compass lose its calibration when stored near the Riflekühl, which has a powerful magnet in it that wipes out the Kestrel compass calibration whether the Riflekühl is on or off. It is recommended you keep your Kestrel away from the Riflekühl to keep your calibration.