Digital flow limiter for small pond pump?

[plantguy123]

Hi. I am using a small pond pump to drip water onto a rock that I am growing mosses on for a timelapse. I am using simple irrigation flow limiter valves but I am noticing that they are not always 100% consistent in terms of the water that they output.

Does anyone know of a digital flow limiter for small pond pumps (or larger pumps if that's all that's available)? I am thinking that that would allow for more precise and consistent control. I have found cheap-looking digital drip controllers on Amazon but I need something high quality as this timelapse will be going on for 3 months. To clarify, the stream coming out has to be a relatively fast drip or a very small stream - I am just using 1/4" irrigation tubes. It's for macro photography so we're talking small amounts of water - it just has to be very consistent to prevent variations in moisture levels from shot to shot.

Thanks so much, any leads would be appreciated!