Alta II Calculator
Date:  _____________       Observer:  ________________   

Sample Description   ____________________

Reflectance =    (sample voltage - dark voltage)                                    ALTA # ______
                            (reference voltage - dark voltage)

Dark V (mV) =
Color
λ
Reference
 Sample # _______
Trial-#1
%Reflectance
 Trial-#2
%Reflectance
Blue
 470-nm
Cyan
 525-nm
Green
 560-nm
Yellow
 585-nm
Orange
 600-nm
Red
 645-nm
Deep Red
 700-nm
IR 1
 735-nm
IR 2
 810-nm
IR 3
 880-nm
IR 4
 940-nm