Modbus+poll+key+full !exclusive! Access

Why do engineers insist on a rather than a demo or free tool? Here are three scenarios:

For weeks, the system had been stuttering. A "Slave ID 12" would drop off for milliseconds—long enough to trigger a safety valve but short enough to vanish before the log could catch it. To the casual observer, it was a ghost in the machine. To Elias, it was a puzzle that required the version of his toolkit. modbus+poll+key+full