Hello David,
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What you are suggesting is obviously a good solution. However, it is WAAAAAY above what my "hobby budget" can afford. To make matters worse, Keysight will not do any business with private individuals, at least in Europe. You'd have to find and alternative calibration lab, which would calibrate the meter but would not probably not replace the battery since HP does not document this replacement.
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Cheers,
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Joel
