Hi Marco, all the EyeOne Pro come with a Certificate of Performance where a so called "Next Calibration Due Date" is specified. If your instrument was used when you bought it and you don't have this certificate, the general rule is that a new instrument is intended for recertification after two years and from that moment on every year a certification is needed. This is according to XRite. If really certification is needed every year to trust the instrument measures, is something that has been discussed a lot in the past... I would say it depends on the use that you are thinking of for your instrument. Anyway, after 5 years, I would go for maintenance. Cheers Fabrizio Il giorno 26/ago/2010, alle ore 18.02, manold@xxxxxxxxxx ha scritto: > I have a Eye One Pro revB product in 2005. > > Is there a way to > understand if it is time to maintenance? Its diagnostic software is not > so helpful... > > If I compare the measurements of a printed target with > the measurements provided by other spectro and I found coherence, > should even the emissive measurements reliable? > > Thank you > Marco > > > Risparmia con Tutto Incluso Light: telefono + adsl 8 mega a soli 19,95 € al > mese per un anno! > > SCONTO DI 120 EURO! > > http://abbonati.tiscali.it/telefono-adsl/prodotti/tc/tuttoincluso_light/?WT.mc_id=01fw >