Wall-mounted units for use at the boundaries of controlled areas and in subchangerooms. Also ideal for smaller radiation laboratories.

Preferred over portable instruments when the advantages of greater ease of reading, automatic background subtraction, bright displays, separate indication of alpha and beta, and unambiguous alarm indications are considered of particular importance.

· CM7 uses a 100 cm^2 gas flow detector.

· CM9 uses NE Scintillation Probes (see p14).

· Easy monitoring of clothing, tools etc.

· CM7 works with HFM7 for faster staff throughput.