This is an option for Heiland TRD 2 and TRD Z.
This option allows the selection of one of the basic colors red, green or blue for the transmission measuring illumination. With white, all 3 LEDs are switched on simultaneously. Each keystroke of the "T/R" button changes the color of the light.
This function is especially useful for measurements on negatives with stain. Independent of the developer type Pyrogallol, Finol or Tanol, the separate measurement of the density with white and the density in colored stain areas with blue is possible.
Furthermore, this option can be used very well in technical and biochemical analysis procedures where the density measurement must be performed separately according to wavelength ranges.
Please note:
This option can not be combined with the Range Extension to 6.5 option.
