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The precision of each pair of temperature probes after pairing may meet the error of 0.1°C, and each pair of temperature sensors for the heat meter series industrial temperature sensors confirms to the criteria of Chinese standard CJ 128-2007 and European standard EN 1434 in terms of error range. To avoid MIS installation due to the length of the cable, the two ends of the probe are each marked with a red and blue marker. Upper water is at the red end, while lower water is at the blue end.