| Country of Origin | United States |
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Check the listing for details. Vintage Scientific Corrosion Tester (UNTESTED). Condition: Used, Made in United States. Listed at 39.95 USD. Vintage/Antique Corrosion Tester Twining Laboratories of Southern Caifornia. Model No.100, Serial No. 53. Operation instructions are included on the inside of the box (see pictures). Equipment is untested. The equipment along with the case is in relatively good condition with the exception of the black wires that are attached to the probes. These wire covers are fragile. See pictures for condition.