But Nicola, if I understand you correctly, you are losing money.
If you pay 5 calibrations - say once a month for example - you spend 125 € when the Spyder costs 130 € !
And then ? At the 6.th month ? No calibrator, no money !
I must be mis-understanding you ...
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Here a pro photographer asked me if I wanted him to lend me his spyder for the calibration of my own monitor at my own home.
Cost ? Free.