Thanks Graeme, Is there a way to investigate the problem further? I'm asking because the instrument is working properly with at least two softwares... Sorry for the dumb question, could it be that, being re-branded by quato, it is someway non-standard? All the best Fabrizio Il giorno 30/nov/2010, alle ore 00.11, Graeme Gill ha scritto: > Fabrizio Levati wrote: >> Hello everyone, I recently bought this colorimeter but I'm having troubles >> getting it >> to work on my mac. Going through the mailing list archive I found something >> similar to >> what's happening to me (see attached log). > > Hi, looking at the log, it seems that your instrument is faulty. It returns > the error 1B "NEEDS_OFFSET_DRIFT_CAL" which is described as "A valid offset > drift calibration does not exist". I would say it needs to go back to the > factory for a re-calibration, since important calibration information seems > to be missing. > > Graeme Gill. >