MFR # 87590UPC: 076683875907A simple, effective way to visually check powder charges when using a progressive press. The Powder Checker sits between the powder charging and bullet seating stations. Using a probe rod, it lets the usere visually confirm that the case is properly charged with powder before bullet seating. In addition to spotting a "no charge" condition, the Powder Checker shows low and high charges too. Black oxide finish provides contrast for better visibility.