One of the first digital gamma and neutron dose rate meters
Friesecke and Hoepfner FHT 700A, early 1970s:

We have a Friesecke and Hoepfner digital dose rate meter FHT 700A in a 19" housing, connected to a FHZ111A Geiger-Müller Counter and an old Biorem neutron detector.
The euqipment was bulit in the early 1970s and is still fully operational. The Gamma dose rate meter was tested with a Co-60 Gamma source, the Biorem was tested with an AmBe neutron source. The reading of the FHT 700A is still very close (less than a factor 2) to the nominal expected dose rates.
In a document from the former Nuclear Research Center Karlsruhe on room and exaust air radioactivity monitoring from 1974 (a workshop held on 15./16. November 1973) we find:
"Besonders hervorzuheben ist die digitale Meßelektronlk, realisiert mit dem 19"·Meßkanal FHT 700 A. Dadurch ist nicht nur eine Datenausgabe auf Schreiber, Drucker (gleichzeitig mit Ausdruck von Datum und Uhrzeit), Lochstreifenstanzer (Teletype) oder direktem Rechneranschluß möglich."
"Particularly accentuated is the digital measurement electronix, realize with the 19" Measurement channel FHT700A. This allows not only data output on chart recorder, printer (simultaneous to output of date and time), paper tape puncher (Teletype) or direct connection to Computers."