At the bottom of the old box I found an old beaten up old voltage and ampere meter. The first idea was to modernise the meter but still using the original pointer and scale which both survived the 80+ years that this meter had survived so far. The case was however filled with gunk and remnants of a battery some resistors end other less identifiable stuff. Unfortunately the coil had suffered either from time or other influences to point where it one second would show the correct voltage and the next something totally different. So unfortunately it became a repurposed case of a voltage meter. But the case was made in good quality bakelite and after removing all the innards and the glas it was cleaned from possibly old electrolytes, oil and other stuff you do not want in a voltmeter. I cleaned the glass and hot-glued a OLED display to it and reattached the glas in the case connected an arduino nano with an RTC and a DTC 22. After some programming inspired from some online sources and with my own ideas added to the program the volt meter is now showing the date and time for three seconds after which the time slides out from the oled display and the temperature and humidity slides in. After this the cycle is repeated, watch the video it looks better.