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> Weston d.c. volt milliammeter model 622 with handle
Weston d.c. volt milliammeter model 622 with handle
Weston D.C. Volt-Milliammeter Model 622 with handle
* From: Weston Electrical Instrument Corp.
* Yellow label on inside of top reads "This instrument indicates volts or milliamperes and is calibrated to be within 1/4 of 1% of full scale value at any part of the scale at 25 C. The voltage ranges measure 200 ohms per volt. The 50 and MV ranges measure 10.0 and 20.0 ohms respectively and should be used with leads of 0.026 ohm. For ordinary measurements no temperature correction is required. If greater accuracy is desired multiply readings by: (1 + 0.00007 (t-25C)) for the 50 MV range. Compensated for the other ranges. Standardized at Weston Laboratory, Newark NJ USA Date: Dec. 1, 1937."
* Condition: Good for it's age.
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