The unit is a Black body calibration source manufactured by Nagman, applicable for pyrometers. It has temperature range of 20°C and above, with ambient to 350°C.
The unit features a resolution of 0.1°C, an accuracy of <0.5%, a stability of 0.5°C, and a reading capacity of Min. 1°C. In addition, the device has an aperture of 25 mm, and emissivity of 0.98.