Weighing foods

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I have been weighing everything but have a question about how to enter the correct amount. Here's an example: Today I wanted peanut butter with my apple. The jar of peanut butter says 1 tbsp is 34g. I weighed out 29g. When I go to enter this in my diary, it only gives me choices 1tbsp, 2tbsp 1 container, 1fl oz, 1cup. Question is, how do I enter 29g?

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