I came across the device pictured here recently at Goodwill (a thrift store) for a few bucks. It looked interesting and potentially useful. I hope you enjoy the pictures and ponder as I did who might have built this - it appears to be a TTL-based microcontroller or maybe it's just an interface to something else. There are no markings at all apart from the calibration sticker, and it reveals nothing about the history of this device.
What you see in the pictures is all I know about this device. Since it has no labels or other identification, I suspect it was built by a hobbyist like many of us here. If anybody can shed some light on this device, I'd appreciate it.
So the outside is kind of intriguing, but sure doesn't reveal much about what's inside!
I hope you've enjoyed the pictures. Really makes you appreciate the powerful devices we use today, bread boards and cheap circuit boards!