I recently bought a Spectra Tri Color meter (color temperature meter) from KEH, thinking it would help me figuring out filtration when using reversal film in indoor lit conditions. However, being an "as-is" item, the thing came without a manual.

Having two separately working dials showing red-blue & red-green light-values + a correction table on upper part of red-green scale having to be calculated for on high readings (?) , I see the need for some basic instructions.... I have not found much on the spectra tri-color meter on the net, and certainly no sign of users manual or guidance - is there someone out there having used this meter & can help?

Thanks!