We are offering usb multifunction temperature data logger, this data logger is mainly used for temperature recording during storage and oceanairhighway transportation of foodstuff, medicine, chemicals and other products, especially widely used in all kinds of warehousing, logistics and cold chain, such as refrigerator containers, refrigerator trucks, refrigerator package, cold storage, laboratory, etc. Or in large-sized global supply chain businesses features: easy operation data can be read, printed and saved conveniently more functions, flexible setting for better safety main functions: automatically detect temperature and humidity; automatically upload data; lcd display automatically generate reports including core data, can be printed or emailed directly and saved forever automatically switch to external probe when choose the external sensor features start-up delay, temperature correction, serial number setting, switching between celsius and fahrenheit graphic user interface specifications: temperature measuring range (both internal sensor and external sensor): -40℃~+85℃ resolution: 0.1℃ for temperature, 0.1%rh for humidity accuracy: +- 0.6℃ for -30℃~+60℃, +-1.2℃ for others for temperature +-0.3%rh for 25℃, 20~90%rh, +-5% for others for humidity record interval: 10s~24hour adjustable communication interface: usb interface power supply: cr2450 battery or power supply via usb interface sensor: internal ntc thermal resistor ambient environmental temperature: -30 °c~+60 °c, lcd displays slower in low temperature environment, which does not affect the normal measurement records. It will be fine when the temperature returns to normal. size: 84mm x 44mm x 20mm.