I have seen surveyors turn up with just a set of ladders, a Disto and an iPad. That doesn't cut the mustard in my opinion. 

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As far as it is reasonably safe and practicable, I try to have a good look everywhere, make some notes, and take lots of photos. Below, and in no particular order are some of the tools I use to help me. This is an ever evolving collection as new problems sometimes require new kit. 

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If my computer skills allow, you should be able to click on the photo to be taken to another page about the item selected...