Only works under 20kHz

I got this app to work with ultrasonic transducers but I found out once I started working with it that the shortest time step you can have is 0.5 ms. So at 20 kHz you have 10 peaks per square and is pretty useless beyond that point. Im working with 450 kHz and the display is just a yellow blur. Id give this app five stars if it worked for the frequencies I needed (which most oscilloscopes would) but since it was a waste of money for my needs I give it two stars.

Samoan27 about Oscilloscope