This is a high quality gauge with 1.5% accuracy throughout the full range.
Gauge accuracy is checked at three points at the factory prior to shipping. Over
pressurization, mishandling or extended use with time can decrease / destroy the
accuracy of this gauge. This gauge is warranted to be accurate at the time of your
receipt only. This gauge is liquid glycerin filled for shock resistance. An air bubble is
left within each gauge to allow for expansion with temperature change.