With our brand new advanced Patented Tri-Step and Overall Length Indicator design you will get the best most advanced cartridge measuring gauge made today! The new design incorporates a cut in the base of the gauge that measures the minimum and maximum overall acceptable length for your cartridge. Until now there was no easy way to measure the minimum acceptable overall length of your loaded ammunition. Now with this revolutionary design it's so easy it takes less than a second! Simply drop a loaded cartridge into the gauge and make sure the bullet tip doesn't extend past the gauge base or be less than the bottom of the groove cut in the base of the gauge. No longer is it necessary to measure each cartridge with your calipers, taking time and aggravation. This gauge DOES IT ALL! These new patented gauges measure all important aspects of your ammunition. Chamber Headspace Maximum Case Length Minimum Case Length Cartridge Diameter Maximum Overall Cartridge Length Minimum Overall Cartridge Length (NEW FEATURE!)