1. A dead weight tester
2. Manometer
Elastic transducers ( Force summing Transducers)
1. Bourdon tube pressure gauge
2. elastic diaphragm gauges
3. bellow gauges
4. Bellow gauges to measure gauge pressure
5. Bellow gauge to measure differential pressure
Strain gauge pressure cells.
1. Flattened tube pressure cell (PINCHED TUBE).
2. Cylindrical type pressure cell.
Mcleod vacuum gauge.
1. Thermal conductivity gauges.
Pirani gauge.
1. Thermocouple type conductivity gauge.
Ionisation gauge
1. bulk modulus or electrical resistance pressure gauge.
The above instruments are used in following situations:
| Type of pressure to be measured | Pressure Measuring instrument to be used |
| Low pressure | Manometer |
| High and medium pressure | Bourdon tube pressure gauge.Diaphragm gauge.Bellows Gauges. |
| Low vacuum and ultra high vacuum | Mcleod vacuum gaugethermal conductivity gauges.Ionisation gauges. |
| Very high pressures | Bourdon tube pressure gauge.Diaphragm gauge.Bulk modulus pressure gauge. |
