Devices, methods and systems are provided for monitoring of industrial processes. Devices and systems are provided which include a controller module (2) connected to a probe module (3) having a specified metallurgy and a resistance module (36) capable of determining a specified resistance value to identify the metallurgy of the probe (3) for controller module (2). A resistor device capable of determining a resistance value which identifies a type of metallurgical material is also provided. The devices and systems provided are inexpensive, portable, electrically safe, easy to set-up and operate by unskilled personnel, may be connected to both desktop and portable computerized devices and can provide real-time monitoring of industrial processes.