Analog multimeter, type Multavi 5, manufactured by Hartmann &amp; Braun AG, Frankfurt (Germany), 1957. The instrument is suitabe for direct and alternate current and has in total 32 measuring ranges. Voltage and current can be measured simultaneously. It has two scales, the red marked one is for the alternate current. A mirror below the scale allows a parallax-free reading. Accuracy 1% for the direct and 1.5% for the alternate current. The instrument works with a <a href="https://en.wikipedia.org/wiki/Moving_coil_meter" class="extiw" title="w:Moving coil meter">Moving coil meter</a>
<a href="//commons.wikimedia.org/wiki/User:Harke" title="User:Harke">Harke</a>
<span class="int-own-work" lang="en">Own work</span>