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    Multimeter

    Have any of you used an Extech Multimeter before?  I'm thinking of getting this one: http://www.radioshack.com/product/index.jsp?productId=2104750&cp=2032058.2032235.2032305&parentPage=family However, I'm new to electronics and I am wondering if this multimeter is worth it and if it will...
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    high/ low level indicator

    Will a water level indicator work with anything other than water.  What I want to do is build a circuit that will give me a good idea of how much grain is in some feed bins that you would find on a farm.  I'm tired of climbing up them to check how much grain is in them and thought I might give...
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