While it's true it's hard to know exactly what the OP wants and can do, I have a quick fix that I use all the time in my shop. It's more of a X than a scissor but it's handy as a shirt pocket.

ProLine PL400 Double X-Braced Keyboard Stand | Guitar Center

I'm not sure anybody outside of us musicians would know about these stands. They fold flat, this one is like mine and will easily support 200lbs and is easy to adjust. If you look close there is a lever close to one end and you pull on that and it releases a bar that engages a set of slots at the pivot point. I have several tops for mine. A metal jig top for welding, a regular flat welding top, the top from a heavy duty metal framed table, a wood drawing board top, two cast iron wings from an old table saw, bolted together. There's a wide range of height adjustment and at $65 it's hard to make such a nice sturdy unit for that price. I also have rollers for it to be an out feed support for my different saw's. Yeah, it's not fancy or hydraulic, but it's an easy get 'er done solution.