Hewlett-Packard 431C Power Meter

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Hewlett Packard Catalog CostLow BidHigh Bidaverage
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$9.99 (+~$19 ship) 7/28/09 #160350391702 wax66 (1 bid) (untested-meter not near zero)
$22.50 (+~$9 ship) 8/16/09 #130324224844 kktv (5 bids $9.95 start) (tested - includes cable ("a bit stiff"))

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    Requires external thermister mounts and connecting cable