SMART SENSOR AS816 Mini Digital Anemometer 0.3-30m/s Wind Speed Temperature Air Flow Tester Feature: Wind speed & temperature measurement, 2 in 1 function. Temperature display in Celsius or Fahrenheit, convenient to understand data value. The current wind speed,the average wind speed,Maximum wind speed selection. Low battery warning, so you can quickly to replace battery for the meter. LCD backlight(support turn off or on), clear data reading. Auto/Manual off, don't worry about the power will completely consume as forget to shut down. Specification: Brand SMART SENSOR Model AS816 Wind Speed Measuring  0.3-30m/s                                                                             Wind Speed Accuracy   ±5% + 0.1  Wind Speed Units  m/s, Ft/min, Knots, km/hr, Mph   Current/Average Measuring  yes  Temperature Measuring Range  0-50  Temp. Resolution   0.1℃  ℃/℉ Selection  yes  Backlight Display   yes  Low Battery Indication   yes  Data Hold Function   yes  Resolution   0.1m/s  Max & Min Measuring   Max only  Data Store   ---  Auto Power Off   yes  Power   3*1.5 AAA Battery (not included)  Product Weight / Size     117g /162*47*25mm  LCD display          Wind / temperature measurement range:  Unit   Range  Resolution  Accuracy  ℃  0.0 ℃ -45.0 ℃  0.2    2 ℃  ℉  32.0 ℉-113.0 ℉  0.36                          3.6 ℉  Current consumption    20mA                             Weight       59g (not including battery)  Battery      3V (2*AAA)  Unit            Range     Resolution  Threshold        Accuracy      m/s  0~30  0.1  0.3  ±5%  Knots  0~55  0.2  0.1  Km/h  0~90  0.3  0.3  Mph  0~65  0.2