This is a vintage 1955 U.S. Army tactical dosimeter, designed to measure radiation exposure in the field. The unit contains a series of internal tubes and is operated by shaking and holding it vertically to obtain a reading. Its chemical indicator changes color from purple to yellow orange when exposed to radiation.
Measures approximately 3⅜" × 2¼" × ⅝".
Offered strictly as a collectible, not a functioning instrument. Shows age appropriate wear. Please review all photos.

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