I'm beginner here, so can someone help me. I want measure how much diffirent walls and barriers affecting Bluetooth 5.0 speeds

[Jarkko]

What kind of devices I need to test this?

[Kenneth]

Get yourself two nRF52-DK's, then you can run:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_att_mtu.html