  We introduce a new color index consisting of two spectral band width to
measure TiO absorption band strength centered at 567 nm. Based on the most
up-to-date line list for TiO we regenerate a grid of synthesized spectra and
investigate the temperature sensitivity of the index. The new index behave
similar to older Wing TiO-index where itdecreas emonotonically from coolest
atmosphere with Teff =2800 up to Teff =4000 where the TiO molecules
disassociate. To further examine the feasibility of the new index we reproduce
the calibration using a list of observed high resolution spectra and found
similar results. This index extend TiO absorption band capability to measure
effective temperature of late K to M stars to visual spectrum where it is more
accessible to small telescopes for long term dedicated observation.
