Well, the data etc. can already be read in other recessions, so I only want to write very briefly.
I am very satisfied with the microscope and also with the magnification, which in itself is completely sufficient to have great experiences in microscopy.
Small blood test to determine whether enough water was drunk (money roll formation) can be observed very well, as well as enough animals in the water can be observed.
You can also examine urine for crystal formations, etc.
I bought a normal student microscope years ago and was able to compare it now. Despite the higher magnification, I have to say that the K&F Concept is far better than my old microscope and can recommend it to every beginner.
This is of course my personal opinion ;-)

We bought the microscope for our daughter's 9th birthday. The microscope stays at home and is for closer inspection.
The display is of course great for children. You can look at everything in peace and show yourself things without difficulty. When I think of the boring middle school microscopy lessons, where two or three people had to share a microscope and spent most of the time bored watching the others looking in or trying to find what the other person found so great and desperately tried to describe and then paint everything.....
I'm sure my daughter won't have any problems using this device and if in doubt we can help with the printing.
If I'm wrong, I'll add to the comment after the birthday.

The price-performance ratio is just right! Great device really super cozy, exciting and entertaining microscopy with the family!

It's nothing fancy, but it does what I need it to do. The app on my phone that you use in conjunction with the oscilloscope is a little annoying as I have to figure out where up, down, left and right is. I hope there will be some major improvements to the app itself because then the usability would be much better, but the oscilloscope itself is not difficult to use at all once you get the hang of it. The quality of the pics/videos isn't the best, but for the price and the ease of use of the scope itself it's definitely on par. When I first got it I zoomed in on everything I had around me and it was pretty cool to see things like that. It takes a bit of practice to figure out how to focus it clearly and on something specific,

Awesome! A great tool for anyone!

It is nothing fancy but it does what I need it to do. The app on my phone that you use in association with the scope is a little annoying since I have to figure out which way is up, down, left and right. I hope there will be some major improvements on the app itself because then the ease of use would be much better but the scope itself is not hard at all to use once you get the hang of the controls. The quality of the pictures/video is not the best but for the price and ease of use of the scope itself then it is definitely on par. When I first got it I zoomed in on everything I had around me and it was pretty cool seeing stuff like that. It takes a tad bit of practice to figure out how to get it clear and focused on something specific but once you do the quality is not bad at all in my opinion

The first application was to look for hay mites, which are difficult to see with the naked eye, but they can be seen quite clearly under this microscope and I'm sure most pests on plants or pets are easy to spot. The microscope has paid for itself from day one. If you keep small pets, this is VERY convenient. Was able to easily identify hay mites. While many small pets have hay mites, you need to keep an eye on numbers.

It is a great gift for children. You will learn a lot about the world around us. I imagine both adults and children will be fascinated by the things they find in the garden, it opens your eyes to a world happening on a micro scale. Showing off the sheer beauty and design of insects and plants, it brings a simple delight. It's hard not to smile when you're focused on the work at hand.

I've also discovered tons of fossils in common garden rocks sold by garden centers. In fact, many rocks contain tiny fossils that cannot be seen without a microscope.

Seems to be well made apart from the stand which only needs a few grams more weight to make it stable.

Using it by hand is nearly impossible, microscopes require a stand as the slightest movement can cause you to lose focus.

Many use it for stamps, money, and things you may need to examine along the way.

Have used small microscopes that cannot be connected to a computer. They're decent, but a strain on the eyes to the point where they're uncomfortable. If you're a certain age, you know what I mean by that.

Also very useful for soldering and examining circuits.

I bought this to show my grandchildren how much more life there is. We have had a lot of fun.

This a plastic microscope that I purchased for around $115. I got much more than I expected. It is better than a toy and not a professional tool by any stretch. I am able to take very good pictures and video via wifi on my cellphone. Both lenses work very well. It does what it is supposed to.

I am extremely happy with my purchase. I included a video and cropped picture :-)

Excellent quality for its low price, everything works. Ideal for casual hobbyists or teenagers.

Completely in line with the price