TT-210 and TT-500 is 0-10V 4-20mA hockey puck head mounted Temperature transmitter, it accepts all kinds of thermocouple and RTD inputs and coverted them into an analog signal such as 4-20mA and 0-10Vdc, this head mount temperature transmitter is a two wire loop powered transmitter, which can be mounted to temperature sensor junction box. the input is configurable via PC and android cell phone. Configurable via cell phone is a great features to have as everybody carries a smart phone nowdays, which means the configuration can be conducted almost anytime anywhere