What is elm 327 chip
The elm 327 chip is a PIC microcontroller that has a program written by elmelectronics.
The current version, as well as the original recorded microcontroller itself, you can see and purchase from their website.
They sell the cost of a chip with a program almost at the cost of a ready-made Chinese interface with a program copied by them. But you will be sure that your elm 327 is original. (whether or not you decide).