potassium meter Mg/L vs ppm

[JackBlasto]

I got a potassium meter from Hanna instruments to read my planted tanks water content and the reading displays in Mg/L

I don't quite understand the conversion of that to ppm or if that is ppm? Can someone help me understand how to read it. Thanks.

 

[aqua_chem]

mg / L is the same as ppm.