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SparkFun Electronics will be closed on July 3rd, 2015 in observance of Independence Day. Any orders placed after 2:00pm MT on July 2nd will be shipped out after the weekend. Thanks!

Member #226428

Member Since: May 18, 2011

Country: United States

  • I just got a couple of these this week and did a quick test. With the .125 inch magnet squares I have to be about a quarter of an inch or less away from the reed switch for it to activate. With a magnet out of an old hard drive (quite a bit larger than the magnet square) it was around an inch.

No public wish lists :(