I have an iPad with an app called GoodReader, which allows me to decently mark up scientific articles. Yet, even a little bit of sun renders it useless.
With kindle — my cousin has one — you can read in the sun, but it seems the capabilities for marking up scientific articles are nigh on non existent.
It seems like ReMarkable might be excellent, but the price tag (>620Dollars) is forbidding.
Any suggestions below 300Euros?