What is the difference between a pressure gauge and a negative pressure gauge?
The pressure gauge measures the positive pressure, and the negative pressure gauge measures the vacuum degree (negative pressure).
According to the pressure type, it is divided into negative pressure gauge, differential pressure gauge and positive pressure gauge, so the negative pressure gauge is only one kind of pressure gauge.
The negative pressure gauge measures the pressure that is negative pressure relative to the local atmospheric pressure. The negative pressure gauge is also known as the vacuum pressure gauge, but there are still some slight differences in concept, which are not shown here.
If there are no special instructions, the pressure gauge we generally say refers to the positive pressure gauge by default.
