Fluke's 1551A and 1552A “Stik” thermometers provide the measurement accuracy, durability and safety required for industries such as oil and gas production and petrochemicals—with no mercury hazard. The Fluke 1551A “Stik” thermometer features a thin-film RTD sensor that provides repeatable accuracy of + 0.09 degrees F over its full range from  –58 degrees F to 320  degrees F. A stainless steel sheath protects the sensor, making it much more rugged than the glass stems of mercury thermometers, so they are much better suited for challenging environments.