What if every Royal Navy capital ship at Jutland had the rangefinders of a Littorio-class battleship?
Short answerThe German High Seas Fleet would face devastatingly accurate British fire and would likely be sunk.
NotesThe counterfactual supplies all Royal Navy capital ships at Jutland with rangefinders comparable in quantity and quality to those of the Littorio class. These were among the finest visual rangefinders conceived. Applied across the Grand Fleet, that fire-control advantage would sharply increase the danger to German ships. The High Seas Fleet would probably be sunk instead of merely driven away.