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Fredrik --
I think you may have run into the problem of "real" EV numbers versus the "adjusted" ones that some meters present.
"Real" EVs represent Exposure Values based on ISO 100. For example EV 10 represents exposures of 1/2 s @ f/22 or 1/500 @ f/1.4, or any other equivalent settings.
Some meters, such as your Minota (I think), read out "real" EVs directly, regardless of the ISO setting; but other types change the EV values to adjust for changes in the ISO. Unfortunately, these adjusted EVs (athough they're "correct" as far as the meter's own calculations are concerned) are not the values that Expo/Dev expects. It wants "real" EVs, based on ISO 100.
Some Gossen meters (I'm unsure of the models) use their own set of numbers that resemble EVs but are really 5 digits higher. Using these values in the Expo/Dev will be disastrous.
I'd recomment the Minolta meter; it's relatively affordable, convenient to use, and has seemed to be accurate and reliable. But you can use ANY meter with Expo/Dev if you first set its ISO on 100 (regardless of the speed of the film you're using) and read the numbers from the EV scale.
Again, when using Expo/Dev, set your METER on ISO 100, regardless of the film's ISO. The correct working speed is set automatically by Expo/Dev as soon as you select a film/developer combination in the Constants screen.
I don't know of any reliable way to test the accuracy of a meter, and I don't believe it's a serious concern with modern meters. The weak link in this process is really the photographer; if you visualize and interpret the subject sensibly I'm fairly sure meter calibration won't be a problem.
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