If you are planning to buy Oscilloscope then USB Oscilloscope like Analog Discovery 2 might be the good option . USB Oscilloscope are low cost Oscilloscope, there are number of USB Oscilloscope with cost ranging from 170$-400$.

Fig 1: Analog Discovery 2 from Digilent
Similar Low Cost USB Oscilloscope are: DScope C20P [Cost: 179$], LabNation[Cost:229$] , PicoScope[Cost: $349]. However this are only those Oscilloscope which we have reviewed, so please review yourself also while buying it.

Fig 2: Comparison of different USB Oscilloscope [Details taken from respective oscilloscope websites at Jan 2019]
We have a small Unboxing Session with this USB Oscilloscope. We are using this Oscilloscope for Digital Signal Processing and Noise Cancellation Project.
https://youtu.be/hG1ZEwbl944
YouTube Playlist of Analog Discovery on: Unboxing, using Waveform Software, and using Analog Discovery 2 with Xilinx ISE ChipScope for Debugging Design.
For more details about Oscilloscope:
https://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/
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