I’m lazy and use a Peak DCA55 to measure transistors which will automatically give you the leakage reading for germanium with the added advantage of identifying the pins for you so you don’t even have to refer to the datasheet. This is an alternative from information posted by RG on the Geofex website and will allow you to measure gain and leakage for much less money. The layout is for PNP transistors but to test NPN just reverse the power and DMM connections.
Have a look through the article on Geofex for further information, but the main procedure is included with the layout:
