For HVAC Environment Exhaust and Blowers -Features and amp; Benefits :Measures airflow volume and velocity ambientand surface temperaturesUses heavy-duty vane probeJumbo 4-digit LCDMin/Max memory + data holdTime-stamps up to 16000 data points forlogging/uploading via RS-232 interfaceSpecifications :Airflow Volume Measurement Range:0 to 1908300 CFM (0 to 54000 CMM)Airflow Velocity Measurement Range:80 to 5910 ft./min (0.4 to 30 m/sec)Airflow Measurement Accuracy: ?2 percentage Ambient Temperature Measurement Range:32? to 122?F (0? to 50?C)Ambient Temperature Measurement Accuracy:?1.5?F (?0.8?C)Surface Temperature Measurement Range(using Type K or J thermocouple):50? to 2372?F (10? to 1300?C)Surface Temperature Measurement Accuracy:?0.2 percentage Dimensions:7.9 x 2.9 x 1.4 in. (203 x 76 x 38mm)Power Source: 4 ?AA? batteries (included)Includes :Molded hard case and probeBatteries User?s manual