Unique design for non-contact infrared ear thermometer calibration. For Hospital, Biomedical department, nursing station, factory, distributor or any situation needs to verify the preciseness of ear thermometer. Precise temperature control with high stability.Ready to use in 15 minutes. Small in size, lightweight and easy to carry. Special Ambient temperature control for great black-body stabilization. Precise temperature control with resolution of 0.001℃.