Transparent thermocouple experimental instrument

Transparent thermocouple experimental instrument, housing in cuboid shape, an exhaust fan and an exhaust fan switch are mounted on the left side surface; a power switch is sequentially arranged on theright side surface of the shell from bottom to top; positive terminal, negative terminal, a current magnitude control switch and a display screen, a heat-insulating plate is arranged at a position 5cm away from the left side surface of the shell; a ceramic heating barrel is fixed to the left side face of the heat insulation plate, and a thermocouple positive binding post, a thermocouple negativebinding post, a digital temperature sensor and a single-chip microcomputer are arranged on the right side face. A part of a thermocouple and a digital temperature sensor are arranged on the inner sidesurface of the ceramic heating barrel; positive and negative binding posts of the thermocouple are electrically connected with the positive and negative binding posts respectively, the two digital temperature and display scree