This compact thermo-hygrometer 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 thermo-hygrometer can be set up to log measurements over a given period. Real-time data-logging thermo-hygrometer measures ambient temperature and humidity. Kit includes: thermo-hygrometer, four AAA batteries. Dimensions: 9. 4"H x 1. 5"W x 1"D. Weight: 3. 2 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. Bendable probe shaft (3. 7"L x 0. 43"Dia. ) enables easy access to ducts. 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. Maximum operating altitude: 6561'. 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.