Wind speed display: four-digit display, maximum 9999 Sensor: infrared laser-cutting of tube Sampling rate: 2 times/second Automatic shutdown: 10 minutes (can be manually turned off) Operating environment: -10~50C, maximum relative humidity of 80%, indoor altitude Less than 2000m parameter: Model: TA641A Measuring range: 006~300m/s Accuracy: 02+ (2% of reading) Resolution: 001/01/1 Wind temperature: Measuring range: 0~45C Accuracy 2C humidity: Measuring range: 0 ~ 99%RH Accuracy: 8%RH Storage environment: -10~50C, maximum 70% relative humidity (with battery removed) Product size: 152 x 55 x 33mm Display size: 37x41 mm Weight: about 135g (without battery) supply: 3X15VAAA (R03/LR03) Colour:black+red Material:ABS Package Contents: 1 x Wind Speed Gauge 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.