This compact anemometer by Reed Instruments can be used either stand-alone or with the Reed Smart Series app (available for download on Android and iOS). When connected to the app, the anemometer can be set up to log measurements over a given period. Real-time data-logging vane anemometer measures air velocity, air temperature, and relative humidity. Kit includes: anemometer, four AAA batteries, protective cap. Dimensions: 6. 9"H x 1. 5"W x 1"D. Weight: 3. 8 oz. Can be used either stand-alone or with the Reed Smart Series app (available for download on Android and iOS). Provides wireless Bluetooth 5. 0 connectivity with a range of up to 246'. Easy to operate, designed for one-hand operation. Measures air velocity (m/s, ft. /min, km/h, and mph), temperature, and humidity with a maximum operating altitude of up to 6561'. Integrated 1. 3" EBTN LCD display provides flexibility for use without a mobile device. Magnetic backing allows the instrument to be mounted to metallic surfaces. Tripod mount makes possible long-term monitoring. Features a low battery indicator and auto shutoff. Batteries provide a life of up to 50 hours. Temperature measuring range: -4 to 140-degrees Fahrenheit. Humidity measuring range: 0-100% RH. Air velocity measuring range: 118-4921 fpm; 0. 6-25 m/s; 2. 1-90 km/h; 1. 3-55. 9 mph. Connect, measure, and log data from up to six instruments simultaneously. Meets or exceeds the CE, UKCA, FCC, and IC ID standards. 1-year manufacturer limited warranty. Safety Data Sheet.