Product DescriptionThese came to us along with several 1950s-1960s era Civil Defense items which had been in storage locally since. Full box of 50 Bendix manufacture CD V-742 Dosimeters, each in its own box wrapped in plastic. These are about the size of a fountain pen and were used to test radioactivity, and are capable of measuring exposure from 0-200 roentgen. Each is marked with the triangle CD marking of the Civil Defense. These dosimeters require a CDV-750 charger in order to function.