The 4180 Series Precision Infrared Calibrators (photo) includes two new models, 4180 and 4181, which according to the manufacturer are easy enough to use in the field and accurate enough to use in the laboratory. The 4180 calibrator has a temperature range of – 15°C to 120°C, with radiometric (non-contact infrared) display accuracy of ± 0.40°C; and the 4181 calibrator measures from 35 to 500°C, with radiometric display accuracy of ±0.35°C. The 4180 Series calibrators have features that allow users to address quality issues commonly not covered by other calibrators in the same class, including emissivity and size of source effect. Additional features including target stability, target uniformity, 6-in. target diameter, traceable radiometric calibration, and compensation for the emissivity settings of the radiation thermometer being tested overcome some of the other most common limitations. — Hart Scientific, a division of Fluke, American Fork, Utah