The Mark 7 Digital PowderCheck Sensor can automatically stops the machine if a grossly incorrect powder level is detected inside the case. If this happens you will then see a notification on the computer tablet to check the case powder level. A must-have for people that want full confidence that every round produced has powder. Gen 2 Digital Powder Check Sensor comes complete with probes for: Small pistol Small rifle Large pistol Large rifle Compatible with the following Mark 7 Loading Machines & Autodrives : Evolution + Autodrive Evolution RL1100/CP2000/Super1050/1050X Autodrives 650 Pro/650 X Autodrives How it works: The user attaches the probe that corresponds to the case type and size to the sensor rod. Then adjust the sensing probe assembly to the correct height for the desired powder load by moving the sensor die up or down and secure the die. When the press is operating, the probe is automatically inserted into the charged case. This moves the sensor bar into its measuring position. If the sensor's infrared laser beam is able to pass through either the sensor bar's "over charge" or "under charge" window then the notification is triggered. Sensitivity is dependent on powder type and user adjustment. Works for all our products in the Autodrive line as well as Evolution PRO.