The need for adequate monitoring techniques led to the investigation of many possible monitoring systems. The difficulties associated with the detection of very low energy radiations have necessarily complicated basic detection devices, and individual specifications are, therefore, often necessary for each particular monitoring requirement. Practical monitors can be separated essentially into two groups. One group consists of monitors that render constant or immediate indications of activities within the monitored media. The second includes tritium collection systems that use water vapor collection traps for subsequent analysis of tritium. The report discusses these two types of monitors.