BENETECH GM8901+ High Accuracy Anemometer Wind Speed Gauge Temperature Measure Digital LCD Display Meter Measuring Tool Features 1. Measurement of wind velocity, temperature and flow 2. Unit conversion of wind velocity,temperature and flow 3. Measurement of MAX and MIN wind velocity 4. Measurement of 23V max and average wind flow 5. Data holding,storing and deleting function 6. Low battery indicating function 7. Auto power off function (power off autocratically if no further operation for 10 minutes) 8. Large LCD display, backlight 9. Retractable drag rod Specification 1. Measuring Range: - Air Velocity: 0-45ms, 0-140kmhr, 0-8800Ftmin, 0-88 knots, 0-100mph(accuracy +-3%) - Air Temperature: 0 degree C~+45 degree C, 32 degree F-113 degree F(Accuracy+-2 degree C) 2. Resolution: 1 degree C, 0.1ms 3. Units of velocity: ms.ftmin, knots, kmhr, mph 4. Power supply: 3 x 1.5V AAA battery (not included)