Instant Display for Air Velocity and Temperature. Maximum, Minimum and Average. Easy Airflow Volume Calculation (cfm/cmm). 10 Memory Data Storage/ Recalling/ Clearing. Data Hold/Test Function. Low battery indication. Auto Power Off. Measurement range -50 to 70 C. Resolution plus/minus 0.1 degree. Accuracy plus/minus 0.9 F for 32 to 122 F (plus/minus 0.5 C for 0 to plus/minus 50 C), otherwise 1.8 F (plus/minus 1 C). Operating Environment 14 to 158 F (-10 to 70 C). Sampling time 1 second. Includes 3 AAA batteries.