Thomas 1071 Traceable Clock with Thermometer and Humidity, 12-1/2" Diameter, 10 to 130 degree F, -20 to 55 degree C

The Thomas 1071 Traceable Clock with Thermometer and Humidity measures air temperature and humidity and keeps precise time. The thermometer measures temperature from -20 to 55 degrees C (10 to 130 degrees F), with an accuracy of + or - 1.5 degree C. The humidity gauge measures humidity from 0 to 100 percent relative humidity (RH), with an accuracy of + or - 5 percent. The clock's timing accuracy is + or - 0.01 percent. The thermometer is traceable to National Institute of Standards and Technology standards, indicating that it is calibrated to International Organization for Standardization (ISO) 17025 levels. The Thomas 1071 is used to measure air temperature and humidity in storage rooms, laboratories, and offices.SpecificationsPower source(1) AA batteryTemperature range-20 to 55 degrees C (10 to 130 degrees F)Temperature accuracy+ or - 1.5 degree CStandard metInternational Organization for Standardization (ISO) 17025Face diameter12.5"Weight1 lb.Digital thermometers are instruments used to measure the temperature of air, liquids, or surfaces electronically. They may measure temperature in Celsius, Fahrenheit, or both. Most digital thermometers use thermistors, which are small electronic resistors. Thermistors are made out of metals that conduct electricity within a certain range and become more conductive the warmer they get. A microcontroller inside the thermometer measures this electrical conductivity and converts it to a temperature, which is displayed on an LCD. Digital thermometers are used in a wide range of applications, including in laboratory settings, food service and storage, and in doctors' offices and hospitals.Thomas Scientific manufactures lab supplies, equipment, chemicals, and instruments for scientific research. It is a registered contractor for the United States Federal Government. The company was founded in 1899 and is headquartered in Philadelphia, PA.What’s in the Box?Thomas Traceable Clock with Thermometer and Humidity(1) AA batteryTraceable certificateInstructions

• Analog clock with thermometer and humidity gauge for measuring air temperature and humidity
• Measures temperature from -20 to 55 degrees C (10 to 130 degrees F), with an accuracy of + or - 1.5 degrees C
• Measures humidity from 0 to 100 percent RH, with an accuracy of + or - 5 percent
• Timing accuracy is + or - 0.01 percent
• Calibrated to ISO 17025 traceability standards for reliability of measurements