Same size? The K8 is a lot smaller than the Rad Safe. K8 is 1.5" by 1" weighs .5oz Cost $134 RadSafe is 3" by 1.5" Cost "hopefully <$200" <a href="http://www.coneinstruments.com/CIcatsub1.asp?cat_id=11970" target="_blank">http://www.coneinstruments.com/CIcatsub1.asp?cat_id=11970</a> Maybe Paradigm took a little too long to bring Rad Safe to market.