Well, as you probalby know, this is a 100% Open Source DIY Geiger counter kit, including case and the dedicated tube (SBM-20)!
This Geiger Counter kit is for EDUCATIONAL PURPOSES ONLY. Don’t even think about using it to monitor radiation in life-threatening situations, or in any environment where you may expose yourself to dangerous levels of radiation. Don’t rely on the collected data to be an accurate measure of radiation exposure! Be safe!