Another way to make ad money is by affiliate traffic, but that depends quite a bit on what kind of tech we're talking about. If we're talking consumer products, you can link to Amazon, otherwise you'll be working through affiliate platforms and direct relationships.
The difficulty here is the potential for a conflict of interest. The best way to handle this IMO is to make a clear distinction between your monetary interests and editorial decisions, and as transparent as possible about how you make money. The Wirecutter does a great job with this, with a sidebar note in every article that links to a full explanation of how they operate: