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Author Message   G3bill Tinkerer Username: G3bill Post Number: 48 Registered: 12-2012 Rating: N/A Votes: 0 Posted on Sunday, January 27, 2013 - 02:25 pm:    Not an answer but which F-1 do you have? If you have a 6Volt battery I believe most call that a F-1N (capital N), button cell battery for meter only think is original Mechanical F-1 & F-1n was a later type with a few upgrades. If I'm wrong slap me silly cause I can't delete