How to use multimeter to detect the signal voltage, power supply voltage and resistance of sensors,

The output current of the pressure sensor you mentioned should be 4-20MA, and the power supply voltage should be 12V or 24V, which is more likely. If you want to judge the quality of the sensor by resistance, it is generally impossible, because it is integrated and original, and it is generally difficult to measure resistance, so you can only judge its quality by measuring its output signal, such as voltage and current. Another is that the sensor itself has its parameters, such as working voltage, whether the output signal is voltage or current, parallel measurement of voltage and series measurement of current.