And I really have to say that this device perfectly meets all my requirements. The microscope is already delivered in a very valuable and stable packaging. The device is also very stable due to its structure and the heavy base plate, and makes a very valuable impression. The adjusting screws for fixing and adjusting the focus are very stable and do not move. The built-in (replaceable) battery easily lasts a few hours, unfortunately the two additional lights have to be operated by an external power source, which makes outdoor use a bit difficult, you have to take a power bank with you if you plan to do something like that, but the internal one is enough Illumination of the tube actually also completely off. The service / menu is really very well done and self-explanatory. I find the HDMI output very practical, with which even larger monitors and/or projectors can be connected. The storage on a (supplied) SD card is also very good. Conclusion the price is absolutely OK for this microscope. And I would buy this part again and again. It's awesome for schools and classrooms. The only thing it could still have would be a WLAN transmission then it would be perfect. Still a brilliant piece