Product review (4 stars): same as the store, less than half the price
I originally thought this product was faulty, but it turns out that it is fine once I got plumbers tape and a tight enough connection. The test stuff it came with was totally dry (the reason for the 4 stars vs 5), but this is the exact same thing Best Buy was selling for $30. Making your own test solution with dish soap and water proved to work well enough (use it generously it to make sure your connection is tight.) I am not sure that there is a product out there that makes this any easier, so for what it is, it does it job.