The Geiger-Müller counter is an instrument used for measuring ionizing radiation in Experimental Physics, and in several applications that involve characterization of background radiation.
This particular model is designed for laboratory use.
Wireless Subunits are battery powered devices with unique communication addresses. They are capable of relaying sensor data, and also include various I/O capabilities.
The 2.4GHz transceiver, and small form factor make it an ideal replacement for interfacing various sensors to the SEELablet. Multiple subunits may be used simultaneously.