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The following notes are automatically scraped from Google,DuckDuckGo,
Yahoo and Yandex they might not pertain to the correct model!
CountryUSA
ManufacturerAccurate Instrument Co. Inc. New York
ModelTube Tester 257
Year: 1968Service or Lab Equipment
Wave Bands- without
Power Type110 Volt AC
Dimensions350 x 90 x 230 mm / 13.8 x 3.5 x 9.1 inch
Net Weight1 kg / 2 lb 3.2 oz
Initial Price47.50 USD
Notes The Accurate 257 Tube Tester was advertised as a "new improved model 257" in 1969 and 1970. Tests Novars, Nuvistors, 10 pins, Magnovals, Compactrons, Decals. Individual section testing for shorts, leakage and emission. Leakage sensitivity up to 5 Megohms. 4.5" dual scale meter with dampening chamber.
SourceMyFile: Accurate-257_Valvetester_TubeTester-1968.pdf