BT03 Bluetooth Temperature Data Logger. Is Bluetooth Low Energy temperature data logger with the latest Bluetooth 5.0 technology. It can collect temperature of the surrounding environment. Such data can be recorded as history data. BT03 can store up to 53248 pieces of the temperature data. Mobile phone with Bluetooth 4.0 or above can download and install App. It can store and monitor temperature of the environment comprehensively. Its characteristics are small-sized, low-weighted, easily portable and highly accurate for wide use in cold chain logistics, archives, labs, museums, etc.