There is an unbelievable amount of facility contained within this app, much of which I am unable to comment upon, as it far exceeds the requirements of the occasional DIY user such as myself. However I have already been able to locate and put to good use several of the specialized calculation processes to meet my specific needs.
There are also various functions which are of general practical use in non-handyman aspects of life, too. For instance the Currency Converter really is something I use regularly when making international transactions. Helpfully it automatically linked to the Internet when being accessed, in order to ensure that the financial information was updated and fit for purpose.
There are also many different facilities for converting units of measurement of different types and a World Clock, just to begin with. (It would take all day to describe this app in accurate detail and would take a highly skilled building trade professional to elaborate on the usefulness of the whole range of accessible calculation tools.)
From my personal perspective, this really is the "Swiss army knife" of calculator apps and I would not hesitate in recommending it to others requiring the flexible options that it facilitates.
There are about 135 different converters / calculators dealing with weights + measures to ohm's law + Paint + carpet calcs to things to do with concrete + roof measurements. There is also a basic calculator + note book + a world clock ect ect.....