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Can you open it to see if it is using an internal capacitor to drop the voltage. (I know nothing about these, but as you indicate it is reading high, either it needs an external resistor or it has an internal reactive impedance that would vary with frequency would be my guess. An internal capacitor would go along with Brian's observation that they used external trimming resistors to make up for a variation with frequency, and your experience that it's reading high.)
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