There is a reason that RM Young, Campbell Scientific and Met One stuff costs so much. If you were to buy it new it wouldn't be accessible to many except the very well to do hobbyist. Things fit. Things are drilled on a jig or computer driven mill, and plastic is form injection molded.
I am amazed at the slight cost of some of the arduino and RaspPi sensor boards with quite good sensitivity, but that is at the risk of them being designed with a different philosophy, and then assembly where labor is a very small part of the whole picture.
There is something about the feel of a solid piece of equipment and the technology to have tested it to 'almost' NASA limits. Problem is that drives up the cost to a point that only the government and the research labs at Universities can afford the stuff. The balance point I guess.