In the past 50 plus years I have purchased or used a fast variety of analyzers for myself and the technicians that I employed. Looking back over that time most of the analyzers performed adequately for those times, my only regret is that I did not have a Wohler analyzer back then. I personally own a Wohler A550 analyzer which I use to demonstrate setup, maintenance, and diagnostic trouble shooting on live fire equipment… I hold an analyzer to a very high standard, as it is the most important piece of equipment that is carried in a service van.«