I made the mistake of buying one last year, the oscilloscope function was measuring 0.5V offset at idle and different voltages in normal measurements, I sent Fnirsi company a Whatsapp email message on every channel and waited for them to solve it with the firmware, they further corrupted the function of correcting a simple voltage offset with another clean voltage. It would be great if they added it or developed it themselves. After pages and pages of messages, I was left unresolved. The answer was that you bought this product from another Aliexpress seller, not from us. But I said the product is your product, but it would be more useful if I talked to the wall.
I mean, it's a product with potential, but since they don't have any engineering development skills, I don't understand why they can't fix the problems of the actual product while spending so much budget on marketing.