Up for auction is a Dosimeter CD V-742 pocket radiation detector pen by Landsverk.

The CD V-742 was a direct-reading (self-reading) pocket dosimeter that measured exposures from 0 – 200 roentgen (R). The 1959 revision of Technical Bulletin TB-11-20 Radiological Instruments for Civil Defense identified the CD-V-742 as one of three civil defense dosimeters, the other two being the CD V-138 and the CD V-730. According to the Bulletin, the CD V-742 superseded the CD V-740. Four years later, the Handbook for Radiological Monitors (April 1963) stated that the CD V-742 had replaced both the CD V-730 and the CD V-740. It is somewhat odd that a document published in 1959 would imply that the CD V-742 superceded anything given the fact that the first CD V-742s were procured in FY 1961, at least according to the FY 1961 annual report.
 
Quoting CPG 1-30: "The dosimeter provided for general operational use is the CDV-742 which has a measurement Range of to 200 roentgens. Until these were available in sufficient quantity, the CDV-730 with a range of 0 to 20 roentgens and the CDV-740 with a range of 0 to 100 roentgens had been furnished. They are still usable. Dosimeters resemble a fountain pen in size and shape. The CDV-742 can be identified by its bronze or gold colored pocket clip. The CDV-742 high range dosimeter is the standard for use in shelter, WER [Weapons Effects Reporting] Stations, emergency service organizations and vital facilities. They would also be used by the millions of civil preparedness workers that would be needed for recovery operations during the postattack period when emergence from shelter is possible.

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