TONY CRADDOCK / SCIENCE PHOTO LIBRARY TONY CRADDOCK / SCIENCE PHOTO LIBRARY
Weighing scales. Close-up of the part of a weighing scale. The scales have been calibrated in both metric (upper scale) and imperial (lower scale) measurements. The weight of the object on the scale (not seen here) is indicated by the position of the pointer. Photograph of a scale used to weigh postal packages.
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