Learning basic electronics. Have a few multi-meters.
I'm researching "cheapie" less than $100 oscilloscopes.
I read that the most important spec is bandwidth.
I've noted that $40 to $100 scopes have severe bandwidth limitations ranging from 200K maybe up to ~1.0 MHz with reasonable (+/-5% ?) accuracy. I've noted one ~$80 scope that advertises 100 MHz bandwidth, but is reasonably accurate only below less than half that, maybe 30 to 40 MHz. I'm wondering if all the cheapies greatly exaggerate their specs like this. They call it "Chinese specs", I've learned.
What I would like to know is 1) what type of testing can be done with reasonable accuracy with such low bandwidth scopes, and 2) what types of testing should be totally out of the question/avoided.
I understand the guideline that a scope should have a bandwidth 5 times the frequency of the things being measured. My question deals with what types of circuits generate frequencies that are in this lower bandwidth range.
My scope functionality question pertains to testing these kinds of circuits: Beginning hobbyist testing such as in Platt's Make: Electronics or Basic Arduino type systems.
$100 is my absolute limit; preferring $40 to $80 range. This is just for a "toe in the water" "explore the basics of scopes" sort of thing. I know that if I spend "just a mere $200 more" I can get a "real scope." And no, don't want to mess with used or eBay.
Here are 4 scopes in my price range:
https://www.amazon.com/dp/B07QML4LJL/?coliid=I3UEZDO1F0D9V8&colid=3B04RKX85L5W0&psc=0&ref_=lv_ov_lig_dp_it https://www.amazon.com/dp/B07V6795WP/?coliid=I3IXRDY73S9RI5&colid=3B04RKX85L5W0&psc=1&ref_=lv_ov_lig_dp_it https://www.amazon.com/dp/B07XBL4BTL/?coliid=I31BECTM93K5LJ&colid=3B04RKX85L5W0&psc=1&ref_=lv_ov_lig_dp_it https://www.amazon.com/dp/B07TNPYLS5/?coliid=I1RS7IOEMH7PJ6&colid=3B04RKX85L5W0&psc=1&ref_=lv_ov_lig_dp_it