Compare function, free to set upper and lower deviation, red and green indicator light and buzzer sound and light alarm settings automatically;

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；

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Lower deviation: the difference between the minimum permissible size of a part and its basic size.

下偏差：零件最小极限尺寸减去其基本尺寸所得的差值。

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Investments with a high standard deviation over one year have a lower standard deviation when measured over longer periods.

FORBES: The Efficient Frontier

Or there is no investment with a lower standard deviation for the same expected return.

FORBES: The Efficient Frontier

As you can see in the graph below, when combining such assets, returns generally shift to the lower right: higher return and lower risk (as measured by standard deviation).

FORBES: The Multiple Rewards of Multi-Asset-Class Investing