Not only judging by sight but absorbency measurement is also possible wavelength 562n*m* .
Specifications
Model number: F-200
200/box
Cleaning class determination kit
Kit configuration: Test tube x 5 pieces, Reagent A 100mL x 2 bottles, Reagent B 20mL x 1 bottle, Wiping agent 20mL x 1 bottle, Swab for wiping 100 pieces/bag x 2 bags, Color scale, Nozzle x 1 piece
RoHS3 (EU)2015/863 Certificates can be issued
[About RoHS]