Image, Stock Photo A operator’s hand is holding steel calibration weight to place on the analytical balance. Concept of quality control in a laboratory.

A operator's hand is holding steel calibration weight to place on the analytical balance. Concept of quality control in a laboratory. balance calibration hand laboratory scale steel weight globes pharmacy precision closeup heavy kilogram symbol metal science weight scale measuring industry weigh reference silver scientific chrome test grams work iron tare instrument qualification measure accuracy clean equipment line measurement white set stainless brass metallic small industrial quality control tweezers