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What is the material that was tested to check the blue led,the IR led and the beam.

Hello,

My name is Shay Eliyahu and i want to develop smoke detector.

i sow the presention and i don't understand what kind of material was tested in the smoke test when you recieved the linearity of Blue IR and BEAM.

you also can send your answer to my private mail:

shay.eli@telefire.co.il.

Best regards.