The Digital Anemometer by Horizon is user-friendly and brings extra value for both teachers and students to experiments by allowing students to acquire specific data that can be utilised in finding the most efficient wind pitch blade combination at any given wind conditions or how if at all relative humidity and temperature affect hydrogen production.Features:Air Velocity Measurement Range: 0.3 to 30m/s (±5%)Temperature Measurement Range: -10 to 50°C (±1°C)Humidity Measurement Range: 0%-99% (±5% at 20%-90%)Air Velocity Unit Selection: m/s ft/min knots km/h mphBeaufort scale°C / °F selectionMax/Min/Avg Reading SelectionHold FunctionWind-chill IndicationLow Battery WarningAuto Power Off (with override function)Calibration FunctionResolution: 0.1m/s 1% Battery included (3V round cell)