2 in 1 Handheld Oscilloscope Signal Generator (Upgraded), Digital Automotive Oscilloscope 250MSa/s Sampling Rate 80MHz Bandwidth, Portable 2.8” 0-1000KHz Adjustable Signal Generator, with 10X Probe

These scopes work well for monitoring myTransmitter waveform output and receiveraudio output in my amateur radio.

internal battery powered; the recharge circuitry leaves much to be desired as a basic USB charger WILL NOT charge it, i have to put it on a 67W rapid charger to do that. otherwise is works

Very fastI like it’s keyboard, it designed as a menu matrix for quick function accessIt has FFT for frequency domain response it’s a plusThe signal generator is very clean smooth waveformI like the rechargeable build in battery, makes it very handy

There are slicker looking DSO's (Digital Storage Oscilloscopes) but they are lower bandwidth. I'll trade the slick package for the superior circuitry of this Zeeweii DSO1C81 "super cost effective" at $39.99. That said I don't have an 80 MHz signal generator to test the bandwidth however I did too much research and based the purchase on reviews of similar models by Zeeweii, for example TechCornerTV Electronics review of the DSO1511G which has higher bandwidth 120 MHz and is double the sampling rate at 500 MSa/S. The 250 MSa/s spec says its real time scope with a capture memory of 480Kbit which is 60K 8 bit samples. I don't know why the Amazon description says "simulated bandwidth of 80 MHz".This DSO feature packed, it has vertical and horizontal cursors, auto measure functions, AC/DC coupling, standard trigger auto and manual either positive or negative edge, there is a menu overlay when you press the function key which makes many of the key combinations easy to enter you don't need a cheat sheet. The manual is 14 pages and doesn't explain everything there are a lot of features you have to figure out, for example the zoom feature (you change the timebase and use the left/right arrows to scroll the waveform). Holding the Func the pressing Menu inverts the screen colors and the black background becomes all white very cool not mentioned in the manual (they need a readme). There is a built in signal generator it goes DC to 1 MHz and has various waveforms including sine, square wave with duty cycle control, triangle, noise, and others. The sine wave goes up to 5 MHz, they're all fixed at 3V.When I received it I could see a little plastic tab to tear off the screen film, but on mine it broke off so I needed to use a scraper then metal blade and finally pulled up the corner to remove the temporary new plastic film screen protector but that made a tiny scrape .. that was quickly forgotten when I started to using the scope and you can't see with the nice display, I could put 4 stars instead of 5 because of that and it needs a readme file but for $40 and 80 MHz bandwidth is has to be 5 stars.One review says there's no probe tip, fortunately that wasn't the case for me, you just have to pull to snap off the probe hook section it takes a little force, and it snap back on when you push a bit extra.I did find when you turn on the reference (no explanation maybe for the FFT?) it messes with the cursor function and I can't turn it off without power cycling. Yes FFT means its a spectrum analyzerTruly amazing product at 80 MHz bandwidth for $40.

Great value. Been involved with electronics and equipment for decades. This level of functionality was unheard of in a small portable device much less for $40! My only complaint, if you want to call it that, is that the interface is non-intuitive. Not that hard to get used to really but the occasional user will benefit by keeping the manual close by. Clear display and even does limited storage and FFT. Grab it and go be measuring as much information about a waveform as you can imagine (almost)

This oscilloscope can detect my RC controller antenna signals at 27 MHz and 49 MHz. It is also easy to use.

I mostly like this little scope. One feature is that it doesn’t try to do too much. It is simply a small, portable oscilloscope (and function generator) and focuses on that while doing a good job. It has one channel and is not overly tiny and hard to see. The 80 MHz bandwidth and 250 Msample/s sampling rate are good. This is a nice size instrument measuring a little over 3” x 4” x 1” and is quite light. It fits comfortably in the hand and it is still small enough to fit in your pocket. The screen is relatively large at 3” diagonally and is quite legible. The USB-C charging port is on the top with a small red/blue LED indicating charge status. A USB cable is included.The panel is good. There are 12 physical buttons with a good feel and a well-designed layout with clear captions. I opened the box, took it out and went through some basic functions without even opening the manual. I have normally found that to be impossible with small portable oscilloscopes with a limited number of tiny buttons or touch pads labeled with obscure legends and with multiple layered menus. In contrast, the most basic operations of this scope are intuitive. The auto set button located and adjusted waveforms quickly. Both auto and manual triggering can be used. The only problem was with the output pins which are not labeled so I did look in the manual to see which was signal and which was ground (gnd is on the left. I stuck a label on it). Hooking up the probe gave a nice, flat square wave with no adjustment of the probe needed. Adjusting amplitude, peak widths and location was quick and simple with the clearly labeled buttons.Unfortunately, for anything beyond that, consulting the manual is still a necessity. The Menu and Func keys have multiple functions that are described in the manual such as Menu + mV to access the function generator, and press and hold Func to move the 2nd horizontal cursor. That can be a little tricky since the Func key is itself a second option for the power on/off button which is also activated by a press and hold, so there seems to be three operations, press, press and “short” hold, and press and longer hold. That seems to be the usual tradeoff with small portable scopes like this with no knobs and a limited number of buttons. At least the manual, while brief, is reasonably well written and useful, although some features such as that the 12 small labels displayed after pressing the Func key (mostly) refer to the 12 buttons on the device are just left as things you need to figure out on your own.There is an option to capture the display, but it appears that it can only be viewed as a tiny, unlabeled thumb view, or deleted. Other options for captured images seemed to be present, but I could not access any of them. The readings agreed well with my bench scope and this can work nicely as a simple, pocket-size field oscilloscope, but like other small, portable scopes that I have seen it either requires frequent use or preparing a cheat sheet with all of the multi-step key presses needed for all but the simplest operations.