For cases of the type you mention I would probably recommend not naming the brands. The reason for this is that the manufacturer is unlikely to be happy if you say that their equipment is not very good (and they can't all be good or there is nothing to write about). This is particularly important if they have given you samples/equipment to use for research.
The lab I'm at has done several comparisons of various software and microscopes for surface metrology and in all cases the equipment/software is just referred to as A, B, C etc.
While from my point of view the reasons for doing this are purely maintaining good relations I expect there is a legal aspect too. I know we have received long loans/discounts on some instruments which presumably involves a contract saying we can't publish anything negative about the instrument.
If a company has provided some equipment used in this sort of thing you may wish to put them in the acknowledgements. Although be aware this may de-anomimise you data. If very few people make an instrument of a certain type saying thanks to company X makes it obvious what it is. On the other hand knowledgeable readers could probably make an educated guess anyway.