ELECTRICALLY OPERATED RADIOMETRIC THERMOMETERS; ELECTRICALLY OPERATED INFRARED THERMOMETERS AND COMPONENTS, NAMELY, INFRARED SENSING HEADS, TEMPERATURE INDICATORS, AND CONTROL UNITS; TEMPERATURE MEASURING DEVICES, NAMELY, THERMOMETERS; NON-CONTACT INFRARED THERMOMETERS; CONTACT INFRARED THERMOMETERS; THERMOCOUPLES; THERMOMETERS NOT FOR MEDICAL USE; LABORATORY EQUIPMENT AND SUPPLIES, NAMELY, THERMOMETERS