Comparing uncertainty in length measurements

So for each of the 6 cylinders there are 2 different measurements taken by 3 different devices. What is the best way to graph this data to compare the uncertainty of the different devices of similar readings, seeing as how using the same graph for all 6 cylinders showing the height avg & uncertainty by each of the 3 devices would just cause the plots to be stacked on top of each other. Can you advise me in some direction that eliminate plotting 6 different graphs?

I think perhaps the most effective way to handle the brass cylinders results and analysis is just to use a table. There are a couple trains of thought here. You could show a table with a row for each measurement device for each cylinder, or you could even have a table that just has one row per measurement instrument and combines the error over all the brass cylinders.

I think the best way to quickly assess which measurement device is 'best' is to probably have the shorter table. Also, make sure to quote a 'standard' that allows you to compare you calculated density against something to see how good a job each instrument did.