Anticollision RFID??

I’m having a hard time finding any RFID readers that will handle multiple simultaneous tag reads. I found a reference to a microchip microID dev kit that has been end of lifed… I find tons of papers describing the protocol and whatnot, but not hardware.

Does anyone have any ideas?

I need to read somewhere around 15 or 20 tags as an inventory and notify if something is missing. Maybe RFID isn’t the right solution, but due to size limitations for the tags, it’s the only thing I can think of.

Sorry for starting another RFID thread.