a very useful tool when reloading. I had the old Alpha Master unit but changed to a Caldwell setup recently. Has lights built in so no issues with cloud cover and lighting, and sends all data to my phone and stores it so I don't have to sit there with a pen and paper to record info. magneto speed looks nice. I talked to the guys at SHOT last year and seems like they are picking up speed and market share. nice to have it attached to the rifle, especially if you are using it at a public or indoor range. friend just won one in a PRS match, can't wait to test it out.