The UK Medical Devices Directive, in common with most National Regulatory Bodies, requires measuring devices to be checked every year (aneroid devices need to be checked every six months). The specification of the greenlight is that taking into account the worst case tolerance of all components and the range of environmental conditions, only 1 in 10,000 devices would need any form of recalibration each year. The greenlight 300 has been validated to the New International Protocol of the European Society of Hypertension by the Mayo Clinic in the United States, giving further independent proof of its accuracy and suitability as a replacement for the mercury instrument. The greenlight 300 is also sold as a test reference manometer for checking aneroid devices another indication of its reliable accuracy.
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