Txt--file as float number

 I have some numbers,from a sensor,have been saved in a txt document. Now I want to load these numbers as "value" but not "string".Since it is an analog signal sensor, the value is not accurate. So I will set a data range to judge weather the sensor has been active.  As you know,the "string" can not be compared the size.  

I`m a Chinese student.English is not very well. Hope you can understand what I said. Thanks.

Search for AsValue (String) node.

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