500 scale to 700 scale on ppm pen

[SofaKingStupid]

Does anyone know how to convert my readings from the 500 scale that my pen reads, to the 700 scale that my feed chart requires? My pen dont don’t do ec.

 

[Douglas.Curtis]

I'm pretty sure it's divide by .500 and then multiply by .700, since the reading on your 500 pen is the EC reading times .500.

Yes? No? Anyone?

 

[SofaKingStupid]

Thank you Douglas Curtis.