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A reading of 1.8 ounces.
1.8 ounces over the target, or 1.8 ounces above 12 ounces. -
A reading of 0 ounces.
12 ounces -
A reading of -2.3 ounces.
2.3 below the target, or 2.3 ounces less than 12 ounces.