Peter, > The test program from X-Rite will only test if the device is working > properly, but can not tell you if the measurment is o.k. (filters > could have aged for example...) One way to tell is a) send the instrument back to X-Rite for re-certification or b) measure some kind of radiometrically calibrated lamp (Optronic outrageously prohibitive). >... Also a one > day test at the germany PMPF last year showed that i1 Pro readings are > near to reference devices like Minolta CS-200 and CS-1000. What does PMPF stands for? Do you J. Raimar Kuhnen? Him and I have been corresponding a lot lately in the context of various instruments pros and cons. He's also in Deutchland. > Unfortunatelly there's no way for an end user to check the accuracy of > his device. And even "absolute" accuracy in the context of LCD calibration is far from "automatic". > Best regards > Peter Roger Breton