1. FLOW: Kg I hr, Litter I min, Gallon I min. M3 I NM3 I HR. (GASES)
2. PRESSURE: Force acting per unit Area. P = F/A Units: Bar I Pascals I Kg I CM I, Pounds
3. LEVEL: Different between two heights. Units: Meters, M M, C M, %.
4. TEMPERATURE: It is the degree of hotness or coldness of a body. Units : Degree Centigrade, Degree Farenheit, Degree Kelvin, Degree Rankin.
5. QUALITY: It deals with analysis PH, % C02, % 02, Conductivity, Viscosity.