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Vintage Knopp Voltage Tester 0-600VAC or VDC - $8
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Measures voltage, both AC and DC from 0 to 600 VAC or VDC
It is a SDP-2 tester, which was manufactured from 1930 to 1964
(Yes, when they made tools that last lifetime.
Works on voltage and magnetism, so there is no electronics to go bad
$10.00 is for the tester only, no box. The box is actually worth more, will sell it for $100.00
I found 1 for sale on Ebay, Price was $20.00 + $7.00 shipping, I'm only selling this for $10.00