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By far the most common US civil defense meter on the market today. This is a simple ion chamber radiological survey meter, specifically designed for high-radiation fields for which Geiger counters will give incorrect readings . Survey meters do not read alpha or beta radiation. They work by radiation penetrating the case of the unit and the enclosed ionization chamber to produce a visible reading between 0.1R/hr and 500R/hr (X0.1, X1, X10, and X100 scales). Any source of gamma radiation would be expected to cause a visible deflection of the meter, so it might be assumed that such a radiation field could be dangerous. Such a meter would not be expected to detect the presence of radiation except the very high levels that might be found in the event of a nuclear weapon detonation or a major release of radioactive material as from a nuclear reactor meltdown. These units are in good condition, however, we do not warrant their functionality, accuracy or performance in a gamma or beta environment, or otherwise.. In the unlikely event that a maintenance issue would occur, the manual (reprint) has a rather extensive troubleshooting and corrective maintenance section, including repair and replacement of resistors, diodes, etc.