This Anemometer/Thermometer's results can be displayed in your choice of meters/second, feet/minute, km/hour or knots with an accuracy of +/-2%. Functions include max-min-avg functions, automatic power off, RS232C output and a detachable probe for easy replacement or repair. The large LCD simultaneously displays temperature, airspeed and unit of measure. The 0.5" characters are easy to read from different angles thanks to a unique contrast control. Each unit includes a 9V battery and hard carrying case.