Signal strength inaccurate Samsung Galaxy Xcover

I have this "problem" as in the title. The signal dBm reading is inaccurate and certain app needs more accurate readings. When there are four bars, the dBm is -89dBm, and three it's -93dBm and one -101dBm and zero -111dBm.
The signal strength reading is dependent from bars.

My app needs more accurate readings between the bars, for example -90dBm and so on. How to improve it?
Hope you understood, it's a very little but annoying issue.

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