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You need to eat more!
Just check the yellow pages in your area for scales or weights and measures. Most of them will certify a scale.
I don't know about servicing a liplock scale. I doubt anyone would service it but if you get it working , they will certify them for a fee.
A good way to do it cheap is get a known weight and just check the scale with it. If you care about ounces accuracy , you need something better than a liplock anyway.
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