However, it's important to note:
* Compound gauges often show both psi and inches of mercury (inHg). This allows for easy comparison to vacuum readings.
* The low side of the system refers to the evaporator side, where the refrigerant has a lower pressure than the high-pressure side (condenser).
Therefore, a compound pressure gauge on the low side of a refrigeration system will usually display both psi and inHg, but you'd mainly be interested in the psi reading for the low-pressure side.
