• As with many IR thermometers, it is important to have the Caregiver® and the patient at a “comfortable” ambient temperature for up to 20 minutes after a patient has been in an unusually cold or hot environment. It is not routinely a challenge if the unit has been kept in a uniformly maintained thermal environment (e.g. exam room, patient room, etc.). Operators should exercise common sense in heavily air-conditioned rooms or when patients may be directly located under cooling vents or heat lamps. Consult the Instruction manual for further details.