Here is a project found on the Internet. It embodies exactly what is meant by the category  "Working Start Trek TNG Replica Technology - no facsimile".
A tribute to Jeremy S. Cook. Excellent work. It’s interesting how “the future” sneaks up on you. One obvious source of inspiration for the products themselves, and for the people that would eventually build the data-driven world we live in today, is Star Trek. One of the most intriguing pieces of tech that these future-dwellers possessed was a device called a Tricorder, giving them all kinds of useful situational info. Though we aren’t quite to that stage in computer development — yet — that didn’t stop YouTuber obso1337 from turning a toy tricorder into something that works in a more realistic way using a Raspberry Pi Zero.... Read more here.

Source: "https://blog.hackster.io/toy-star-trek-tricorder-turned-into-the-real-thing-bf7fc1c0f28f"