Two calibration protocols were developed to match between instrument readings of paired upgraded fineness and maturity testers (FMT, Micromat model). Each protocol is a two-step process that involves adjustment of the digital pressure indicator sensitivity followed by the PL and PH piston stroke lengths. In one protocol, instrument controls are set at responses corresponding to a range of Micronaires. For the other protocol, the controls are set using a high Micronaire cotton. The calibration procedures are described and evaluated over a range of Micronaire values.