I just went and looked at a BAMA mirror site, and lo ! I have found a
file that says it's for the Mk IV. I've downloaded it, but now need
to find some software to open it. It says that it is .DJVU format ??

The site has links to viewers: see eg
http://bama.edebris.com/manuals/avo FWIW I use Irfan. And you will
need then the djvu plug-in (from the same site). But I am sorry to have
to tell you that if you have downloaded mk4elect.djvu it is the manual
for the Avo Electronic Testmeter Mark 4. (I know 'cos I got some of my
manuals from BAMA and looked there yesterday when you first asked: I am
*really* looking for excuses not to get back to crawling around in the
loft!)

--
Robin
PM may be sent to rbw0{at}hotmail{dot}com