• You can select either a measure of uncorrected flow rate (in ml/min) or a cumulative volume (ml) over a measured time period (seconds).  The latter method is most useful for dry volume meters, bubble meters, etc.

• In addition to barometric pressure, you can account for any internal pressure within the gas flow meter (which may occur if you are using relatively high flow rates and/or small-diameter tubing).  Internal pressure can be in units of torr, PSI (pounds/square inch), KPa (Kilopascals), or mm of water (if you are using a water manometer).

• You can adjust the calibration temperature of your flow instrument.  Most such devices are calibrated for a temperature of zero °C, but some (like Singer dry volume meters) may be calibrated for 20 °C or other temperatures. 

Other functions...

• The 'Add to ∑' button adds the current value into an internal register that is used to compute an average value (displayed with the 'Show Average' button).  These functions correctly account for whether the display is set for standard cubic centimeters/min (SCCM) or standard liters per minute (SLPM).

• The 'Store' button saves the currently displayed STP flow rate as the default flow rate for gas exchange calculations (in units of SCCM).  Either an averaged flow rate or an individually-computed value are accepted, and the display setting (SCCM or SLPM) is taken into account.  In addition to saving STP flow, this button also stores a barometric pressure of 760 torr and a meter temperature of 0 °C (this is necessary to retain the accuracy of the STP conversion when computing gas exchange).