Just be aware that knowing the hardness of a blade is not the end all and be all of knife performance. It has to correlate to some level of performance in the blade such as edge holding ability, which usually increases with hardness, and toughness, which usually decreases with hardness. A Rockwell tester will also give you no idea of the grain or carbide sizes in the blade or the distribution of the carbides in the blade. It will also give might give you some indication that there is too much retained austenite when you can't reach the as quenched hardness you're looking for but it can't really detect it. For all those things you need something that can't fit into a small shop, a scanning electron microscope and all the equipment need to prepare a specimen for examination. A Rockwell tester does not say all that much about a blade and it has to be used correctly, like having parallel surfaces. which means that you can't accurately test the edge. That might not be a big problem if you are dealing with a steel with deep hardenability but with a shall hardening steel the hardness of the recasso will probably be lower that the hardness of the edge.
Old age and trechery will always overcome youth and ambition.