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Aims. In this work we develop a technique to obtain high precisiondeterminations of both metallicity and effective temperature of M dwarfs in theoptical.  Methods. A new method is presented that makes use of the information of 4104lines in the 530-690 nm spectral region. It consists in the measurement ofpseudo equivalent widths and their correlation with established scales of[Fe/H] and $T_{eff}$.  Results. Our technique achieves a $rms$ of 0.08$\pm$0.01 for [Fe/H],91$\pm$13 K for $T_{eff}$, and is valid in the (-0.85, 0.26 dex), (2800, 4100K), and (M0.0, M5.0) intervals for [Fe/H], $T_{eff}$ and spectral typerespectively. We also calculated the RMSE$_{V}$ which estimates uncertaintiesof the order of 0.12 dex for the metallicity and of 293 K for the effectivetemperature. The technique has an activity limit and should only be used forstars with $\log{L_{H_{\alpha}}/L_{bol}} < -4.0$. Our method is availableonline at \url{http://www.astro.up.pt/resources/mcal}.

Metallicity of M dwarfs IV. A high-precision [Fe/H] and Teff technique from high-resolution optical spectra for M dwarfs