Hi Martin The X Rite UK service team in Cheshire are very helpful. This is the link to the return for re-cal service: http://www.xrite.com/support_repair_info.aspx If your have an ISO certification, such as 9001, will state that all instruments need to be serviced/re-calibrated to manufactories recommendations. In this case, once a year. Regards Paul The Missing Horse Consultancy Ltd 01442 207626 07899 906385 Fax: 0872 111 7709 http://www.missinghorsecons.co.uk Follow us on: Twitter.com/missinghorse Apple Solutions Expert-Print & Publishing Member - UK TC130 Technical Advisory Group (ISO 12647 Printing Standards) Member - BPIF Technical Standards Committee Lean and green? To save money and become a greener printer, see http://www.greenprinter.co.uk http://www.keeconsultants.com Reduce your carbon footprint http://www.1010uk.org This email and any attachments may be confidential and are intended solely for the use of addressee. If you are not the intended recipient of this message, any disclosure, copying or other distribution is strictly prohibited and may be unlawful. If you have received this message in error, please notify the sender and delete all copies from your system. Email may be susceptible to data corruption, interception and unauthorised amendment. We do not accept liability for any such corruption, interception or amendment or the consequences thereof. We do not accept liability for any action or inaction by the recipient as a result of advice or information contained within this email. ---