This product is a smart multi-function digital meter designed by our company. It is intelligent , portable and durable. It is mainly comprised of a host meter and a specific type of sensor (external sensor is customizable). When connected with different type of sensors it can be used to detect , monitor and record accurate real-time data on the spot. With high performance wireless communication module of GPRS / 3G / 4G / Wi-Fi , this smart digital meter can automatically record and upload real-time on spot data to your smart phone App and IoT cloud platform online 24 hours a day. When the data exceeds the set value, it will immediately send alarm information via smart phone App , SMS and E-mail. It has a built-in 70MB flash memory which can keep max. 110,000 recordings. The historical data can be exported in PDF or CSV format. It also supports bluetooth data printing. With a built-in 5000 mAh high-capacity Li-ion battery, it also can serve as a perfect self-contained datalogger in the field of cold-chain logistics and food / drug transportation. It can work alone for about 30 days without any outside power supply.