At 1:32 -- after engineered I should add comma?
Each tool is engineered? hand-built, the quality...
Each tool is engineered, hand-built and quality-checked right here ... Yes, you need the comma after "engineered". A comma before the "and" preceding the last item in a list (in this case after "hand-built") -- the so-called "serial comma" -- is optional and is included by some people.
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Each tool is engineered, hand-built and quality-checked right here ...
Yes, you need the comma after "engineered".
A comma before the "and" preceding the last item in a list (in this case after "hand-built") -- the so-called "serial comma" -- is optional and is included by some people. I don't normally use it myself, and in this case I would personally not really recommend i