I am new to openROV and I have a question that might be obvious but I couldn't find information on that anywhere. What are these two bended scales I see in the openROV cockpit? See picture below (sorry it is not my picture, but I had none else at hand):
Only the left one changes when I speed up the motors why is that? Is there a way to get rid of these scales? Well, most importantly I want to know what they are and why I don't see any changes except for the left one.