Philips Icoma, Low-Ohm-Meter, 4 wires, warm

1-3-10-30-100-300 Ohm full scale, test frequency = 10kHz
it works like a combination of a low ohm sine wave osc. with a frequency selektive mV Meter, well calibrated to test the R with the 10kHz
this instrument may be the grandpa of ESR testers, it was at home in the Valvo Manufacturing for capacitors.