This is the support of the factory Dear Customer, I confirm you that we cannot communicate the manual for calibration of the CA6412. Our Service company, Manumesure, is able to do the calibration of the instruments. You can contact Ms Florence Deterpigny (in copy of this email) to have more information about the costs of calibration for the clamps which need to be adjusted. Best Regards, Floriane PASQUIER Ingénieur Commercial Export - BENELUX, Europe Centrale et Europe du Sud Export Sales Engineer - BENELUX, Central Europe & Southern Europe Dear M , Contrary to the actual Earth Clamps (CA6416/6417), you cannot do the adjustment of the CA6412 yourself. Unfortunately, I cannot communicate the calibration manual. However, thanks to the calibration loop for example, you can calibrate your instruments to check if an adjustment is necessary or not. So I invite you to check first and to come back to me with the quantity of clamps that you need to adjust. Best Regards, Floriane PASQUIER Ingénieur Commercial Export - BENELUX, Europe Centrale et Europe du SudExport Sales Engineer - BENELUX, Central Europe & Southern Europe 190, rue Championnet 75018 PARIS - France T : +33 (0)1 44 85 44 45M : +33 (0)6 85 54 13 92 floriane.pasquier@chauvin-arnoux.com www.chauvin-arnoux.com fine support from this company Shortly, you DONT get any support