Liquid Fertilizer Monitor:

Fall 2020: I've simplified the fertilizer monitor app to just a graph of gallons per acre by row. I use two monitors on my planter, one for infurrow and the other for my 2X2X2. The flowmeters hook inline with the fertilizer tube going to each row. 1/4" and 3/8" meters are available. The electronics send the flow/acre to the Android app.
See the Order page for parts used.