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ASTM-thermometer 21 F, +174+188°F:0,2°F, Hg Precision thermometers, stem form ASTM 21 F Saybolt Viscosity Capillaries form: yellow enamelled round Hg filling range: +174+188°F in 0.2°F Immersion length: total Total length: 270 mm, suitable for official certification
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