Digital Sensors for Mark 7 Autodrives The ability to use a variety of sensors separates the Mark 7 system from the competition. Ammunition MUST be safe and reliable, whether you are a beginning shooter or a top-level competitor. Progressive and automated presses are also a large investment, so it is a wise move to protect them, your firearms and yourself with our proven sensors. Whether it is ensuring that the spent primer is removed, checking for a correct (or no) powder charge, ensuring that a bullet is present and positioned correctly, or that you are low on primers; we have you covered with the right sensor. All Mark 7 sensors are fully integrated with our computer control box; Mfg: Mark 7 Reloading