![]() Weight of the instrument case is 5 lbs the prospecting stick weighs 1 lb. ![]() Model C-15 is equipped with a G-M tube installed in a separate prospecting stick 36 inches long. Model C-12 is equipped with an adjustable shield to allow exclusion of beta radiation from the internally mounted G-M tube. Models C-12 and C-15 are equipped with headphones, flash indicator, and high-and-low-range ratemeters with ranges from 0 to 0.2 and 0 to 20 mR/hr. The earliest reference I have found to the Model C-12 is this announcement in the October 1949 issue of Nucleonics: "Survey meters for field and laboratory use now available are battery operated. The sliding red metal shield is intended to permit discrimination against beta particles. The thin walled GM tube (Victoreen 1B85) is located towards the top front of the instrument case. ![]() There is a flashing indicator light (lower left in photo) and a headphone jack. The only controls are an on/off switch (right side of photo to right) and a Hi/Lo switch (left side of photo to right) that changes the instrument range. ![]() This instrument was manufactured, sometime around 1950, by Fisher Research Laboratory Inc.
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