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Yes, calibrating procedure are right, LED turns on correctly.....the only problem is that I see 1.38v on multimeter (directly, not in RAMPS). I've checked my multimeter and it's right, it's reading 1.38v on both of my multimeters. About LED: I'm using RED high bright and I've changed position to make sure that light is right on the center of sensor....i've changed a few times to test it. I'm using 1/16 drill rod to calibrate.