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Author Message   Roy Tinkerer Username: Roy Post Number: 11 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, November 13, 2006 - 08:33 am:    In a meter used for photographic purposes the Cds cell is normally capable of driving the meter needle off scale and a resistance is placed in series to calibrate the instrument. It also covers against manufacturing 'spread' i.e. variations in cell sensitivity. The best way, if the existing cell is U/S, is to obtain one from any supply house that can be made to physically fit than replace the resistor with a small variable resistor and then re-calibrate.