Digital Voltmeter V540 Meratronik 1978 with Z5660M WF RFT large digital tubes

Digital voltmeter Meratronic V540. Quite rare. Mine is absolutely working and looks very good. Its main advantage is that it has 6 large-format digital indicators type Z6660 made in GDR.
The photos show how it reads the voltage of a discharged battery on different ranges - from 1000 volts to 1 volt.

It comes with a book of description.