This is an inexpensive surface-mount project that is good for beginners to start with. This kit has its own printed circuit board (PCB) which makes mounting the components easy. Plus, it comes in a pocket size shielded aluminum case measuring 3.5" in length and 1" in diameter. The on-off switch is a pushbutton on the bottom.
The unit needs no adjustment. It will click once each time it receives a high energy particle. If there is a sizable amount of Gamma radiation, it will sound the alarm.
This Emergency Radiation Monitor Alarm is a good addition to an emergency kit since we simply don't know what the future may bring, and whether or not it may become necessary to be able to detect radiation.