Ruby pressure calculator calculates pressure from the ruby fluorescence spectrum (R2 line position) using the original Mao's scale (Mao H.K., Xu J., and Bell P.M. (1986) J. Geophys. Res. 91, 4673).
Temperature correction from Rekhi et al. (Rekhi S., Dubrovinsky L.S., and Saxena S.K. (1999) High Temp. - High Pres. 31, 299) is valid for elevated temperatures only!
"Diamond anvil" scale in a diamond Raman signal derivative minimum, scale is from Akahama Y. and Kawamura H., J. Appl. Phys. 100, 043516, (2006).
"Diamond inside chamber" is for diamond Raman peak position from a diamond chip inside the sample chamber.