Dosimeter, Personal radiation measure. Issued / unissued
Regular dosimeters of various origins and age.
The greens are swedish civil defense / army equipment, there is some issued and unissued versions available, the older ones have Röntgen scale, and the unissued have milli-sievert scale.
The other colors ( silver, yellow, blue... ) are Finnish Civil Defense surplus, all are unissued, there is Bendix, Stephen and Wallac brands.
Dosimeter is re-chargeable device, that counts the cumulative exposure for ionizing radiation, the device requires some basic knowledge and regular checking, both time and exposure. Dosimeter is read by looking thru the lens opposite to the business end, once the start and check measure are known and time the exposure is gained, the remaining "safe" or amount of radiation is easy to calculate.
Metal / plastic costruction
Size: 11...13 cm length, 13-16mm diameter
No guarantee, requires recharge once the exposure is filled.