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You can get the correct clamp on attacment for your Fluke. They automatically scale down the reading to the 10 amp scale you should have on the Fluke. It's not a direct current to meter configuration...
Having said that and looking at the downstream breakers I've got two suggestions...
One, you should probably be on a 200 amp service or more. Can't believe a licensed electrician would put that kind of load on the secondary panel.
Also, I do suggest measuring your current draw but, like others, I suspect either your main breaker has gotten weak from age or you have a corrosion issue.
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Harmlessly passing gas in the grassland away;
Only dimly aware of a certain smell in the air
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