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YH-507F insulation oil dielectric strength tester
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YH-507E insulation oil dielectric strength tester
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YH-507D series automatic insulation oil dielectric strength tester (six cups)
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YH-507BX-2 portable dielectric strength tester of insulating oil
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YH-507B automatic insulation oil dielectric strength tester
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YH-507A series automatic insulation oil dielectric strength tester (single cup)
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YH-261A automatic closed flash point tester
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YH-261 manual closed flash point tester
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YH-264C type oil acid value tester
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