This data logger uses high precision digital temperature and humidity sensor. It features high precision, high speed, good stability, etc. and it is suitable for environment temperature and humidity data acquisition and recording. Widely used for room temperature measuring, such as warehouse management, logistics, transportation, telecommunication room, intelligent building, subway, mall, library and other places and situations. Features: Can set high and low alarm value, and alarm through LED. Temperature and humidity data records. Can record and store a total of 16384 data, a total of 8192 groups. PDF document can be directly exported. USB interface can be connected to computer to extract data. Designed with no screen, save more power and focusing on data recording. Data report is generated directly in the recorder built-in storage, can be read directly on computer. Small size, powerful functions. Directly generates PDF data table and curve diagram function. According to the setting threshold, recorded data tables in different color when it exceed limit value. High precision and high response speed. Sampling interval of 1 second ~ 24 hours, free setting. Support maximum and minimum value function. Specifications: : BSIDE Model: BTH81 Units: / Resolution: 0.1%RH, 0.1 Weight: 80g(approx.) Package Includes: 1 x Data Logger 1 x Base 2 x Sticker 1 x Bag of Screw 1 x Manual