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It is suggested that weighing equipment should be calibrated annually and certificated if required. But in case of critical or high accuracy applications it is recommended that the equipment is checked daily prior to use. A longer certification frequency of two or three years can be justified if the accuracy drift between calibrations is much smaller than the accuracy that is required and if the application is not critical.
No, readability of weighing equipment is the smallest quantity that it will display. Accuracy is the maximum difference between the applied test weight and the displayed weight. Some manufacturers quote the accuracy on the product datasheets. No measuring device is 100% accurate and typically the accuracy of standard weighing scales in a stable environment is approximately +/- (2 x division size) throughout the weighing range.
Tolerance depends on the model of scale. Please refer to the scale User Manual or call our Technical Service department for the specifications for your model toll-free at 866-316-0162.
Yes, it will not affect the accuracy of the scale if the floor or the scale itself is not perfectly level, or if the scale is on thin carpet
Calibration simply means that you are teaching the scale what ZERO weight is, in another words ACCURATE or "span" weight.
Since you are teaching the scale a known weight, it is important to make sure the weight applied is as accurate as possible. Most scales allow you to choose what weight you are using for calibration, they can be 10%, 25%, 50% of the scales capacity. Once defining your calibration weight, and performing a calibration, the scale will mathematically calculate the weight placed on the scale above the calibration weight used.