High Accuracy: /- 1.0 % of reading 40 fpm of Air Velocity sensitivity Store up to 10 duct sizes Analog voltage and PC Communication output option Probe AP275 40 to 7800 FPM (0.2 to 40 m/s) Probe AP100 60 to 6800 FPM (0.3 to 35 m/s) Accuracy /- 1.0 % of Reading /- 1digit Resolution 1 FPM or 0.01 m/s Display 0.5 inch LCD, 4 digits with LED Backlight Operating Temperature 32 to 125F (0 to 50C) Power Supply 3 AA Alkaline Batteries Operating Time (Battery) Approx. 150 hours W 3.2 x D 1.5 x H 6.5 inch (82 x 38 x 165 mm) > Each Unit Includes Rotating Vane Head Extension Rod with Handle Grip Flexible Rod 3, AA 1.5V Alkaline Batteries Operation Manual Carrying Case