My house was built 1965 with plaster walls and I think wood lath, and assume also built to 16" on center for Studs.
What is the best way to find studs in a plaster wall ? (I would like to wall mount a 50" flatscreen TV).

In the previous house that had drywall, the 16" on center rule was't very helpful as it MAY be true if I knew which side the 16" started. Using the $10 battery operated Stud Finders were also very iffy -- I ended up nailing finishing nails through the drywall to confirm whether I found the stud. I can't do the same with plaster as repairing holes is more difficult and the wood lath would give a lot of false positives on the presence of a stud.

Any suggestions for wood lath plaster walls ?