I can't believe no one mentioned MrMobile. I really enjoy his format and editing style. He mostly does phone and watch reviews, but sometimes sprinkle in laptops, and his When Phones were Fun series were awesome.

LowSpecGamer originally does what the channel name suggests, low spec hardware reviews and game on them with jank methods. However, he has since privated his previous videos, and transitioned to history and stories behind tech products.

One other channel that is more to the side of tech "explanation" is Technology Connections. The subjects of his videos are not necessarily "tech" we see in tech channels, but more appliance tech and the history or how it works. His channel is caption friendly too!