Not ready for prime time.

To the developers credit, this app is described as "experimental." Not so ceditable, he is charging a buck for us to bankroll his experiment. It is a fascinating concept, and I hope that eventually the practice will catch up with the theory. For now, I found the results to be off by 10 to 15%, so, far from good enough to put my tape measure away. And, the settings seemed needlessly complex. I understand the need to adjust the temperature, but the frequency, filter, and chirp values should be optimized by the developer instead of the user, it seems to me. And, dont be fooled by the "point and shoot" screenshot with the purple waves measuring 45 inches. The instructional video that comes with the app strongly suggests a much more nerdy stance (scroll right to How to Hold the Phone, above). FWIW, I used this on a 3G iPhone with the latest OS.

hawkster27 about Sonar Ruler