My Calcu-Light XP was reading one and two thirds stops under so I thought I have nothing to lose by opening it up. I tested each of the pots and found the one that set up the calibration. It's a simple tweak and I'm now back in sync with my Pentax Spotmeter.
You have to
Take the battery cover off and undo the screws.
Put the cover back on the battery cover with batteries still inside
Peel back the rear cover (glued on) try not to crease it, a smooth bend should be OK
Undo the two screws underneath the cover.
You should be able to access the blue pot with a brass screwhead that is at the bottom of the meter (there are four. Top left and top right and middle left. You want the bottom right one (see pictures).
Turn anticlockwise to increase your reading
Turn clockwise to decrease your reading
It takes about 2 or possibly three turns for a single number change (which is a third of a stop).
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