The last decade I supervised a significant amount of PhD students, served in numerous PhD committees and reviewed a countless number of papers. During these occasions I always did my very best to give constructive remarks, and lots of young (someteimes even not so young) researchers have acknowledged that it did indeed help them becoming a better researcher. However, over the years I got this nagging feeling that I was often repeating myself; sometimes wondering whether I was sounding like an old grumpy grandfather instead of an active enthusiastic researcher. Worse, I was often giving tidbits of advice but noticed that the overall picture ---the reference framework so to speak--- was lacking. My advice was sometimes misunderstood, neglected or otherwise ignored and I often wondered if I could nail down this reference framework .
You may want to identify certain types of equipment by vendor name and brand or category (., ultracentrifuge vs. prep centrifuge), particularly if they are not commonly found in most labs. It is appropriate to report, parenthetically, the source (vendor) and catalog number for reagents used, ., " ....poly-L-lysine (Sigma #1309) ." When using a method described in another published source, you can save time and words by providing the relevant citation to the source. Always make sure to describe any modifications you have made of a standard or published method.