This thermometer is a standard Reference Materials Thermometer designed by the NIST for pharmaceutical and biomedical laboratories.  It is factory certified to NIST standards and comes with a certificate stating the correction to the nearest 0.005°C.  It provides precise temperature measurement and can be used for calibrating or checking accuracy of other thermometers.  Certified at 0°, 25°, 30°, and 37°C.  Supplied with yellow background for easy reading.