The Redding Model 3 Powder Measure with Metering Chamber offers all of the time-tested accuracy and unbeatable reliability of the Model 3 with the addition of the Universal Metering Chamber. This chamber is positioned right in front of the powder measure for easy reading and setting. Also included with the Redding Model 3 Powder Measure is an integrated micrometer, which enables you to record preferred settings so you can return to them later when you want to recreate the same type of load. This powder measure was crafted from cast iron, giving you a lifetime of durability.