Technical documentation should be comprehensible and well formulated. This can be checked with TextQuest/Refo, for which there is the option of selecting technical documentation as the text type.
Texts of any size can be analysed with TextQuest/ReFo, either in full or paragraph by paragraph.

After the analysis, you can display sentences that are too long or words that are too long, edit them immediately and then see what effect this has on the values of the readability formulas. Since each paragraph is analysed individually, you can see immediately which paragraph needs revision.

The results can be copied from the clipboard and processed further from there.