The K&M Low Force Pack measures in finer graduation than the standard pack (.0005"). Tension applied by the cartridge neck on the bullet is very important for on target consistency. The force required to seat the bullet is an excellent way to quantify the consistency of your neck tension. To do this use the force pack and the special K&M low force 50 lb. indicator (Part #868084) to read force in 1lb increment (.0005"). The Standard Force Pack for the K&M Arbor Press can be added with the 50 lb indicator to the K&M Arbor press measure the neck tension of your reloads while seating bullets. Measures 0-50 lbs of seating force. K&M Arbor Press and 50 lb. Indicator not included.