Single-use radon gas detector. 
Small vial you put in your basement for a couple of days, then mail in to a lab for testing, to see how much radon you've got. 
Source: Hardware Store 
Contributor: Theodore Gray 
Acquired: 29 April, 2009 
Text Updated: 30 April, 2009 
Price: $10 
Size: 2" 
Purity: 0%
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