Manometer also known as steam or vaccum gauge, an instrument for pressure measurement.
PSD file contains six layers clearly named:
1. Scales base
2. Needle (shadow can be deactivated)
3. Border ring
4. Glass (you may like to hide this layer to make scale more clear)
5. Brown pipe
6. Blue pipe
You may like to animate needle by rotating it so as to simulate increasing pressure.
Complementary item:
