Instructions on how to use a Geiger Counter on Vimeo
SAFECAST - SAFECAST launches world first "Virtual Geiger" counter app for iPhone and iPad with turn by turn radiation levels based on it's 4,000,000+ measurements done till date. http://blog.safecast.org/2012/10/safecast-ios-app/ | Facebook
WN B Johnson GSM-110 Geiger Counter with Probe | eBay