any truck scale will have a allowed +/- weight wise. Its very difficult to get an accurate weight on trucks down to the pound that can come across weighing 20 tons or more.
Most scales you will find that they will be +/- 10-50 pounds depending on age. The scale at my yard is brand spanking new. Last one got hit by lighting. The old one was +/- 20 pounds and the new one is +/- 10 pounds.
Just keep a record of your weight. Remember that gas / other things can add or subtract weight depending on how full or empty your tank might be.
Even super accurate scales will be +/- a specific ammount of weight to account for humidity, temp, and other atmospheric conditions.
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