How can I find out how many liters of AdBlue level I need?

Hello friends, I encountered an AdBlue problem in my car. I had it repaired by a mechanic named Zeynel Usta in Eskişehir. Thankfully, I got rid of that problem. I think I've been driving for two years without any problems. I try to fill up with AdBlue every time I go on vacation, and every time I fill up, I overflow. This happened again this year. Then I did some research and found a device called Selcar Obd. I recommend it. It not only clears and resets AdBlue errors, but also provides access to many vehicle parameters. I recommend it. I wish you trouble-free AdBlue days.