这些特性可以包括规范的上下偏差范围或者任何其他和产品或服务有关的各种因素。
They may include the upper and lower specification limits or any other factors related to the product or service.
比较功能，上下限偏差值自由设定，红绿指示灯及蜂鸣器自动声光报警设置；
Compare function, free to set upper and lower deviation, red and green indicator light and buzzer sound and light alarm settings automatically;
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