The document below is the Avo Model 8 Mk 3 test meter operating instructions, which were released with the Model 8 in 1968.
I happen to have a copy of these instructions because my late Father had an Avo Model 8 which he purchased from new sometime prior to retiring from work. Electronics, particularly radio, had been his lifetime hobby, and he treated himself to the ultimate test set just before he stopped work.
Loved seeing the AVO manual again. I repaired and calibrated hundreds of AVO,s in the 80s. I regret not keeping one for myself as they are really iconic today
Regards
Mike Lafratta