Franck-Hertz tube with Hg filling and heating furnace (115 V /50/60 Hz);
item no. :  1006794 or 1023094
and
Franck-Hertz tube with Hg filling and heating furnace (230 V /50/60 Hz);
item no. : 1006795 or 1023095

Note: ..

•	full compatibility to the above mentioned articles is granted
•	professional installation required
•	without installation instruction