scope Takes input from the mic of your phone and draws the waveforms on the screen. Amplitude and frequency resolutions are adjustable. Also has a correlator-mode, which could help detecting the existence of sounds which are very hard (or impossible) to hear, including infra-sounds. Measures sound frequency
justRuler Use screen of your phone as a ruler to measure small objects
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JC Dec This website shows you the decorating work carried out by John Coleman