dave-in-nj:
well he said that he and put the sensor into the flow. so we do not need to concern ourselves about pipe materials, flow rates or even pressures. we have to assume that going to a trade show, the gent knows how to pipe up a thermowell.ALL he is asking for really, is how to display so people walking by his both can see the values from about 20 feet back.
not sure why of the 13 posts, no one is trying to address his actual question.
In my case, because I did not read the whole of the Op's #1 post! Many of us have been down the temperature measurement path before and are somewhat (in my case) myopic and perhaps even a bit biased on approach. Were i to do a demo, I'd use a PC with an external monitor/projector and use the ESP8266 as a webserver much as I did in the project I wrote and referenced in the previous post.... Javascript and websockets can be easily implemented on an older notebook with a modern browser... no need for a fancy new notebook. And the ESP8266 NodeMCU was $3.10 and the other stuff about $1... project cost under $5.
Ray