Martin Hall is NOT a co-inventor of this product. A student of his- a local guy to me in south jersey invented this product while a student of Hall's in FLA. Martin backed him with some money and his name fore the info commericals but had nothing to do with the design or function. The secret of this product is in the green lasers that are more costly than the cheaper red lights. This allows the laser to be seen in day light. google green laser lights and check out the cost and superior quality.
If you really do Lynn's dowel drills- you will not need this product.
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