Feature: 1. [8 BLADES DESIGN] The handheld anemometer is designed with 8 blades, the low friction bearing to ensure high accuracy and sensitive response. 2. [VALUES LOCKING] The maximum, minimum, average and real time values in the measurement process can be locked, stable and reliable. 3. [THRESHOLD ALARM] When it is higher or lower than the set threshold value, the red light will be on for a long time, the measuring value will flash to alarm. 4. [MEASURING RANGE] The measuring range of the anemometer is 0.06-30.0m/s, with high accuracy and fast sampling rate, and wide application range. 5. [DIGITAL DISPLAY] The anemometer adopts 4 digit display, with a maximum of 9999, automatic shutdown without operation for 10 minutes. Specification: Item Type: Anemometer Material: ABS Color: Black Measuring Range: 0.06-30.0m/s Accuracy: ±2% reading Wind Speed Display: 4 digit display, maximum 9999 Sensor: Infrared laser tube cutting method Sampling Rate: 2 times per second Automatic Shutdown: 10 minutes (can be closed manually) Operating Environment: -10-50℃, maximum 80% relative humidity Indoor Altitude: < 2000 meter / 6561.7ft Storage Environment: -10-50℃, maximum 70% relative humidity (take out the battery) Display Size: Approx. 37 x 41mm / 1.5 x 1.6in Battery: 3 x 1.5V AAA Battery (not included). Package List: 1 x Anemometer 1 x Cloth Bag 1 x User Manual