Check the listing for details. Lyman Single Caliber Ammo Checker, choice from .22 to .50, 6mm to 9mm, 20/12ga. Condition: New. Listed at 23.94 USD. Lyman® Ammo Checker™ Single Caliber,ammo not included. ✔NEW ✔Low Price ✔U.S. Shipping ✔Authorized Dealer Ammo Checkers are gauges that verify the quality and consistency of both reloaded and factory ammo. Lyman's Ammo Checkers are precision "Go/No Go" gauges that allow a reloader to quickly confirm that their ammunition will fit in their chamber. The gauges are machined from solid aluminum and cut with custom tooling to SAAMI (or CIP for non-SAAMI calibers) minimum chamber dimensions. Just drop your loaded rounds in the Ammo Checker and if the rounds fit into the gauge flush or below the top surface, they will chamber. Each gauge is clearly marked for caliber and is anodized in a bright orange color so that they will be easy to spot on your reloading bench.