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This smart leak sensor can alert you when your aquarium is starting to empty.

SwitchBot says its new water leak detector not only warns about leaks and drips, but also monitors water levels with an optional submersible cable.

This sounds useful if you want to be alerted that your tank is emptying, your tub is too full, or your submersible pump is rising. It doesn’t require a hub, works over Wi-Fi, and costs $17.99 ($19.99 with cable).

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