Electrical Connections: Located at the back or side flange of the probe. Wires typically pass through the probe interior or hollow shaft, connecting to: the two ends of the heater (H+, H-), the two ends of the thermocouple (T+, T-), and the two ends of the measuring electrode (i.e., inner/outer platinum electrodes, outputting millivolt signals +REF, -SIGNAL / MV OUT). Polishing brings out the jade, and steadfast action leads to distant success.