MEASURE SPECIFIC gravity.Various devices/equipments and their use is described in the table below:Devices/EquipmentsUse to measureHygrometerRelative humidityManometerPressurePitot tubeFlow velocityHotwire anemometerWind velocityVenturimeterDischargeRotameterDischargeOrifice meterDischargeSextantAltitudePyrometerExtremely high temperature(temperature of sun, STAR)GyroscopeSpeed and orientation of moving objectsBarometerAtmospheric pressure