Infrared Tympanic Thermometer Calibration Blackbody from Hotech model 3301 offers the precise and stabilized temperature reference that allows the lab or manufacturer performs the service of temperature calibration. Model 3301 is specially design to follows with ASTM standard. Internal blackbody structure was uniquely designed to generates high infrared emissivity with the temperature stability of ±0.03°C @ 37°C, stable and constant temperature is guaranteed; moreover, it can be re-tune to get the best control if it is under the diversity ambient temperature.