LND712 vs the SBM20

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http://youtube.com/watch?v=JCI4IuTP0RU

Using the Geiger Kit with two tubes installed - the SBM-20 LND712. • Comparing two sources (mantles smoke detector pellet) between the two. • Comparing differance between side of LND712 and it's alpha window. • More info at: • https://sites.google.com/site/diygeig...

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