On the reset of reference value.
The sensor has been adjusted when it is delivered from the factory. Generally, the customer does not need to use it.
This function is mainly for the convenience of customers to set the reference 0 point value of the sensor in different environments.
(assuming that the test value in environment a is a and that in environment B is B, then after adjusting the reference value in environment a, the measured value in environment B is B-A)