High precision headspace resistance standards (HRS) were developed at SRRC for the Micromat model of the fineness and maturity tester (FMT). HRS are stable, physical standards used to create precise differential pressures when air is drawn through the device. FMT calibration PL and PH air flow rates are "transferred" to the HRS resulting in declared HRS PL and PH values. Recalibration and control of the FMT during routine analysis is performed by adjusting the flow controllers to maintain the declared HRS PL and PH values within specification. A leak detector module (LDM) was installed to test for leaks. Routine analysis of 100 cottons is presented based on HRS recalibration of the FMT. Elimination of drift in instrument readings over a 3-month period is demonstrated and confirms earlier work.