|This item has been sold.|
|Leeds & Northrop Model 9912 Run-Up Box|
Leeds& Northrop 9912 Run-Up Box. The run-up box is a battery operated, low resistance source of adjustable dc millivoltage for checking and calibrating instruments which require current flow for their operation, such as deflection type millivolt indicators or dynamic checking of low range micro-max recorders or galvanometer type null balance instruments.
Its output is adjustable from 0 - 120 mV, adjustable to better than 0.02 mV. It comes complete with the original box and two gold-plated straps, as shown in picture.
It is mint. In 1968, the price of this box was $70.
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