The Trerice BX9 liquid-in-glass adjustable angle series thermometers is an easy to read thermometer and filled with a non-toxic, mercury-free, blue liquid. Perfect for applications which require affordabilityand safety, like heating and air conditioning, process piping, tanks, airducts, and all types of building construction. Due to its flex angleadjustment, the Trerice glass industrial thermometer case can be rotated 180° and its stems simultaneously rotated in 10 deg increments. This allows forvirtually any required viewing angle. In addition, these thermometers offer a choice of stem material and length, and have an accuracy of 1% of scale division.