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STLZ-5 Automatic Asphalt Penetrometer
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STLZ-2 Double-digital Display Asphalt Penetrometer
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STLZ-1 Double-digital Display Asphalt Penetrometer
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STLL-7 Full Automatic Asphalt Softening Point Meter (Ring and ball apparatus)
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STLL-5 Infrared Ray Full Automatic Asphalt Softening Point Meter (Ring and ball apparatus)
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STLL-4 Full Automatic Asphalt Softening Point Meter (Ring and ball apparatus)
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STLL-3 Automatic Asphalt Softening Point Meter (Ring and ball apparatus)
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STLL-1 Manual Asphalt Softening Point Meter
