So I spent my last week end working on a full 3V3 to 5V level translator for my Raspberry Pi®. What I mean by "full" is that all the RPi GPIOs (17 lines) have their own translator. I didn't find such a board on the market so here it is!
This is most commonly used entry level Digital Multimeter. It has overload protection and low battery indicator. The multimeter runs on the standard 9V battery which could be easily replaced by removing the screws at the back.