| A | B |
|---|
| pressure gauge | psi (pounds per square inch) |
| tachometer | rpm (revolutions per minute) |
| temperature meter | degrees Fahrenheit or Celsius |
| anemometer | feet per minute (air velocity) |
| manometer | inches water column (in. wc) or psi |
| hygrometer | percent relative humidity (%RH) |
| pH meter | 0 pH to 14 pH |
| vibration meter | velocity (in/s) or displacement (inches) |
| flowmeter | gpm (gallons per minute) or scfm (standard cubic feet per minute) |
| counter | numerical |
| voltmeter | amount of electrical pressure |
| ammeter | amount of electron flow in a circuit |
| wattmeter | amount of electrical power in a circuit |
| frequency meter | number of electrical cycles per second (hertz) |
| ohmmeter | resistance to flow of electricity |
| conductivity meter | ability to conduct electricity (Mhos) |
