Math Channels:

 ... not just A + B. With a PicoScope it means much, much more. All the standard arithmetic functions are supported along with more complex functions involving filters (low pass, high pass, band pass and band stop filters), trigonometry, exponentials, logarithms, statistics, integrals and derivatives. Waveform math also allows you to plot live signals alongside historic peak, averaged or filtered waveforms. You can also use math for example to graph the changing duty cycle or frequency of your signal. With PicoScope math channels you can display up to eight real or calculated channels in each scope view.
https://www.picotech.com/library/oscilloscopes/math-channels