Pool leak detection HOW TO MAKE A LOW COST HYDROPHONE or HEAR WHALES

  Robb's Homemade Life
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You can buy this kit for about $12 in my ebay store at  ... , or you can build it yourself after rounding up the parts. This hydrophone is popular with people that want to find their pool leak or listen to whales or dolphins. I s

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Pool leak detection HOW TO MAKE A LOW COST HYDROPHONE or HEAR WHALES
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