5-in-1 Oscilloscope Plus Function Generator – Debugging Tool with Scoping, DC Reference, Spectrum, PWM Signal, Function Generator – Type C USB Connection Rechargeble Battery | EIM Technology ZOOLARK

From the product dimensions I was expecting something small, but still got a bit shocked after unpacked the product. I bought this for my nephew who is taking 2nd year electrical circuits, and hope he will enjoy some fun with this cute little device.Despite of technical performance, this is indeed a two channel oscilloscope PLUS a function generator PLUS a digital IO PLUS a pair of dual rails integrated into a nice interface with rechargeable feature. Being a senior electrical engineer, I would never rely on this tool for any serious measurements and debugging, and there is no way this product can be comparable to a Tektronix or Keysight instruments in terms of accuracy and precision.But remember this is something that costs only in two figures, yet less than a fraction of those big ones, and can be fit into my pocket. Anyway, if you are looking for a super handy tool to learn and setup experiments for hobby projects or even many university level experiments, this product is almost unbeatable.What I also like is that the package includes a list of accessory wires to help setting up circuits on breadboard, I can tell the efforts from the manufacturer that they really want you to run hardware experiments anywhere possible...

If portability is your number one goal then it would be hard be surpass this device. It is truly tiny. It also functions reasonably well with the described functions including providing a two channel oscilloscope, PWM generation, and sine, square or triangular wave generator, ref voltage signal, etc. However, there are also a few limitations. The display is surprisingly legible but at 1.57” diagonal it is still very small. The three primary buttons (on/off, mode selection, and adjustments) are simply flexible parts of the plastic case and not the easiest to use. Oddly enough, even the manual mentions this as shown in one of the photos.There is no indicator of power remaining on the 250 mAh battery which would be usefulto have . There is also reference to the use of the USB-C port for firmware updates or possibly computer connection in addition to recharging, but I could find no reference to that in the brief manual or on the developer’s website. The two sets of pin connector wires are functional but bulky and have no labels. With the small 2 row, 12-pin interface it is necessary to rely on wire colors to identify the ends which can be tedious, although individual wires can easily be substituted for the 12 pin connectors and that worked fine. The PWM generator and the function generators worked very well as external signal sources, and were convenient when used in a self-contained manner with the built-in oscilloscope. This should be particularly useful in an educational setting.Using an external signal generator, the oscilloscope also functioned fine in comparison to a standard bench oscilloscope as shown in a few photos. However, the oscilloscope had too many limitations for me when monitoring external signals. In particular if there is any means for vertical adjustment of the signal I couldn’t locate it. It seems that only voltage and frequency can be adjusted, and the entire waveform remained in the upper half of the screen. It is still useable, but *really* small in half-screen view. There is no means to capture a signal of course.This is a nice device for students or occasional hobbyist use, but some of the limitations were a little annoying and the price is rather high in comparison with many alternatives, although alternative devices were all larger and usually only single channel. The overall functionality of this gadget was good and I would rate it as a 3.5 if possible, but since not I think it is closer to a 4 than a 3. But not a 5 star item in my opinion,

I spent some time in testing this product and would have gone smoother if the product came with good user's manual, so I had to keep experimenting till I got was needed for the mode I had selectedwhat comes with this only shows what the buttons do (which are very small in size)Does not give examples of each modeThere is no way to know how well or poor the internal battery is nor any LED to let you know what state when connected to your USB chargerBeing the screen is only 1x1 inch square, you may have a hard time seeing a moving frequency pattern or the even smaller values for voltage, duty cycle, frequency, etc.I went to the maker of this product and found no further information on how to use, nor the manual states the firmware could be updated but found nothing on the website to obtain any updates, nor is there any mode to inform you what version the unit has in itHad a hard time getting a frequency showing stable on the screen, so harder to see the exact voltage and frequency values

Have to admit it is truly exceeded my expectations. The device is super tiny which holds really smooth in my hands. I'm also impressed with its build quality, beautiful shape, solid plastic, and decent LCD screen. I tested it on my project, it works just like a normal oscilloscope, and I don't have to run to the lab to test everything. I didn't try other functions but looking forward to giving them a shot. The only comment I have is the buttons on the side, they are a little hard to push that I have to try hard with my fingernails.