Philips PM3305 Oscilloscpe

[Bushbaby]

Its just not been my weekend - I've got gout in my left big toe and I've not had gout for nearly 10 years; I bought a wrong camera lens for a Nikon D700 camera not realising that the DX lenses that I use for my other cameras are not full format and this afternoon in hobbling out to the workshop I endeavoured to use this 'scope and calibrate a test probe with it! Now I think I've made a huge error buying this 'scope!! It does not appear that straight forward a scope to use - the manual I have is incredibly hard to follow in the first instance. Secondly, the square wave signal appears to have a level of noise to it. If this needs a service what the best thing to do as it will be out of my league to do so?
I have I made a big mistake in buying this and should I revert back to using my Tektronics 935a in the first instance for actual work?

Best Regards

Rob