How to do a compression test on your engine *134000 miles*

Hi everyone hope you keeping well. As promised I performed a compression test on my 1.8T golf gti that's done 134k miles. I was very happy with the results considering the mileage its done and the fact that its been running 300bhp on stock internals for the last 20k miles. I used a laser compression tester bought from machine mart and really advise that you don't use these cheap ones off Ebay due to the inconsistency I had in the past. As always thanks for watching and keep safe.