GM4257 (1948)
GM2315 (1949)
GM2883 (1950)
GM4144 (1950)
GM7628 (1950)
GM2317 (1953)
GM6009 (1957)
GM5655/04
(~1960)
GM2308-03 (~1960)
Zelfbouw Buizentester
Buizentester
I-177-b (1953)
AVO meetbrug (1951?)
Brüel&Kjær
2409 (1959)
Zakmetertje (195?)
Telequipment
Servicescoop D31
Tech TE-20 (196?-197?)