Detect beta and gamma radiation with your own portable Geiger counter! This kit includes all components needed to build a completely open source, hackable, working Geiger counter.  A sensitive SBM-20 Geiger tube is included! You will need basic soldering tools and two AAA batteries to complete the kit. Don’t know how to solder? That's ok, you can learn how!

Features:

• Easy to build! Solder it together yourself!
• Sensitive SBM-20 Geiger-Müller tube included!
• This Geiger tube is sensitive to beta and gamma radiation
• LED and piezo speaker alert you to detected radioactivity.
• Mute button for silent operation.
• An ATtiny2313 microcontroller brain that is begging to be hacked!
• Support for several other common Geiger-Müller tubes: SI-3BG, SI-1G, and SBM-20.  HV supply can be adjusted from ~300-600V.
• Headers for serial (9600 baud), in-circuit programming of the AVR microcontroller, and pulse output (to connect the geiger counter to other stuff!)
• Serial data logging!  Counts per second (CPS), counts per minute (CPM), and equivalent dose are reported via the serial port once a second.
• 100% Open Source Hardware! Schematics and layout files are available on the kit website.