Our products are rated in "% of reading" - like deadweight testers - but unlike
deadweight testers, they're not affected by ambient temperature (or local gravity). Other gauges are rated in "% of full scale" - like mechanical pressure gauges.
With our products, the XP2i for example, has a 0.1% of reading accuracy down to 20% of full scale range. This means that one
XP2i gauge can replace multiple "of scale" gauges (see illustration), leaving fewer gauges to maintain and calibrate every year.