Install on your progressive press after the powder drop station to automatically check dropped charges.Checking powder charges on your progressive press can be difficult and is sometimes ignored, even though it's a smart practice.Hornady uses a similar devise on their own ammo manufacturing presses.It wont replace careful attention but helps monitor the reloading process.Works with all powder types and cartridges.Type: Powder CheckerQuantity: 1Weight: 6 ozFunction: Monitors Reloading ProcessCompatible With: All Powder Types