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A scale that is incorrect by one ounce on each weighing, making 100 weighs a day for 300 days a year at a unit price of $2 per pound, will cause an error of $3,750 per year. An error of 3 tablespoons in 5 gallons on a gasoline pump will result in an error of thousands of dollars per year at today's average prices.
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When a device passes its annual inspection, a blue seal of approval is placed on it. If its results are incorrect, the scale is rejected for use until corrected. Samples of the blue seals of approval can be found on scales at a supermarket or pumps at a gas station.
In New Jersey, all large cities and most counties have weights and measures inspectors working to protect consumers from unfair practices.
Highly accurate equipment is used to test and inspect scales and bar code scanners at:
In addition, inspections are performed on:
Many forms of taxes and fees are based on weight or measurement.