This is a container for the Ikea Skadis pegboard to hold the Brymen BM235 multimeter. Dave Jones from EEVblog sells a branded version to support his Youtube channel.
I originally designed it so you could leave your leads connected, but that became a) unstable and b) you had to leave the leads somewhere dangling. Therefor I attached a round container to hold the leads and the temperature probe.
It is hooked to the board using two hooks I use for all my Skadis projects. My printer prints tight enough for me to snap them in without any glue. The friction holds them in place.